Anderman, E. M., Espelage, D. L., Reddy, L. A., McMahon, S. D., Martinez, A., Lane, K. L., Reynolds, C., & Paul, N. (2018). Teachers’ reactions to experiences of violence: An attributional analysis. Social Psychology of Education: An International Journal, 21(3), 621–653.  https://doi.org/10.1007/s11218-018-9438-x

Andreadakis, N., Xanthakou, G., Katsigianni, G., & Kaila, M. (2007). Bullying and Victimization. A reality in the school environment. Hellenic Studies, Epistimes Agogis, 4, 187-195. (In Greek). 

Arseneault, L., Walsh, E., Trzesniewski, K., Newcombe, R., Caspi, A., & Moffitt, T. E. (2006). Bullying victimization uniquely contributes to adjustment problems in young children: A nationally representative cohort study. Pediatrics, 118(1), 130-138. https://doi.org/10.1542/peds.2005-2388

Axford, N., Bjornstad, G., Clarkson, S., Ukoumunne, O. C., Wrigley, Z., Matthews, J., & Hutchings, J. (2020). The effectiveness of the KiVa bullying prevention program in Wales, UK: Results from a pragmatic cluster randomized controlled trial. Prevention Science, 21(5), 615-626.  https://doi.org/10.1007/s11121-020-01103-9

Axford, N., & Morpeth, L. (2013). Evidence-based programs in children’s services: A critical appraisal. Children and Youth Services Review, 35(2), 268–277. https://doi.org/10.1016/j.childyouth.2012.10.017

Bauer, J., Unterbrink, T., Hack, A., Pfeifer, R., Buhl-Grießhaber, V., Müller, U., & Wirsching, M. (2007). Working conditions, adverse events and mental health problems in a sample of 949 German teachers. International Archives of Occupational and Environmental Health, 80(5), 442–449. https://doi.org/10.1007/s00420-007-0170-7

Bradshaw, C. P. (2017). Handbook on bullying prevention: A life course perspective. NASW Press.

Center for Disease Control. (2019, July 8). Violence prevention: Bullying research. https://cutt.ly/ZnbjBbT.

Chen, J. -K., & Avi-Astor, R. (2009). The perpetration of school violence in Taiwan. School Psychology International, 30(6), 568–584. https://doi.org/10.1177/0143034309107076

Cohen, J. (1988). Statistical Power Analysis for the Behavioral Sciences. Routledge Academic.

Cohen, J., McCabe, E. M., Michelli, N. M., & Pickeral, T. (2009). School climate: Research, policy, teacher education and practice. Teachers College Record, 111(1), 180–213. https://doi.org/10.1177/016146810911100108

Cross, D., Runions, K. C., Shaw, T., Wong, J. W. Y., Campbell, M., Pearce, N., & Resnicow, K. (2019). Friendly Schools Universal Bullying Prevention Intervention. Effectiveness with Secondary School Students. International Journal of Bullying Prevention, 1(1), 45-57.  https://doi.org/10.1007/s42380-018-0004-z

Crozier, M., Rokutani, L., Russett, J. L., Godwin, E., & Banks, G. E. (2010). A multisite program evaluation of Families and Schools Together (FAST): Continued evidence of a successful multifamily community-based prevention program. The School Community Journal, 20(1), 187–207.

Dill, E. J., Vernberg, E. M., Fonagy, P., Twemlow, S. W., & Gamm, B. K. (2004). Negative affect in victimized children: The roles of social withdrawal, peer rejection, and attitudes toward bullying. Journal of Abnormal Child Psychology, 32(2), 159–173. https://doi.org/10.1023/B:JACP.0000019768.31348.81

Divecha, D., & Brackett, M. (2019). Rethinking school-based bullying prevention through the lens of social and emotional learning: A bioecological perspective. International Journal of Bullying Prevention, 2, 93. 113.  https://doi.org/10.1007/s42380-019-00019-5

Durlak, J. A., Weissberg, R. P., Dymnicki, A. B., Taylor, R. D., & Schellinger, K. B. (2011). The impact of enhancing students’ social and emotional learning: A meta-analysis of school-based universal interventions. Child Development, 82(1), 405–432.  https://doi.org/10.1111/j.1467-8624.2010.01564.x

Ertesvåg, S. K. (2014). Improving anti-bullying initiatives: The role of an expanded research agenda. Journal of Educational Change, 16(3), 349–370. https://doi.org/10.1007/s10833-014-9232-2

Espelage, D. L., Bosworth, K., & Simon, T. R. (2000). Examining the social context of bullying behaviors in early adolescence. Journal of Counseling & Development, 78, 326–333.  https://doi.org/10.1002/j.1556- 676.2000.tb01914.x

Evans, C. B. R., Fraser, M. W., & Cotter, K. L. (2014). The effectiveness of school-based bullying prevention programs: a systematic review. Aggression and Violent Behavior, 19(5), 532–544. https://doi.org/10.1016/j.avb.2014.07.004

Farrington, D. P., & Ttofi, M. M. (2009). School-based programs to reduce bullying and victimization. Campbell Systematic Reviews, 5(1), i-148. https://doi.org/10.4073/csr.2009.6

Faris, R., Gelmlee, D., McMillan C., (2020). With friends like these: Aggression from amity and equivalence. AJS Volume, 126(3) 673–713. https://doi.org/10.1086/712972

Fekkes, M., Pijpers, F. I. M., & Verloove-Vanhorick, S. P. (2005). Bullying: who does what, when and where? Involvement of children, teachers and parents in bullying behavior. Health Education Research, 20(1), 81–91. https://doi.org/10.1093/her/cyg100

Ferguson, C. J., Miguel, C. S., Kilburn, J. C., & Sanchez, P. (2007). The effectiveness of school-based anti-bullying programs. Criminal Justice Review, 32(4), 401–414. https://doi.org/10.1177/0734016807311712

Finkelhor, D., Turner, H. A., Shattuck, A., & Hamby, S. L. (2013). Violence, crime, and abuse exposure in a national sample of children and youth: An update. JAMA Pediatrics, 167(7), 614–621. https://doi.org/10.1001/jamapediatrics.2013.42

Giakoymakis, V. (2020, May 27). UPD Victim of bullying Vaggelis Giakoymakis, 20, found dead. Keep Talking Greece.  https://cutt.ly/unbjvFD  

Gini, G., Card, N. A., & Pozzoli, T. (2017). A meta-analysis of the differential relations of traditional and cyber-victimization with internalizing problems. Aggressive Behavior, 44(2), 185–198. https://doi.org/10.1002/ab.21742

Gini, G., & Pozzoli, T. (2009). Association between bullying and psychosomatic problems: A meta-analysis. Pediatrics, 123(3), 1059-1065. https://doi.org/10.1542/peds.2008-1215

Goldweber, A., Waasdorp, T. E., & Bradshaw, C. P. (2013). Examining the link between bullying behaviors and perceptions of safety and belonging among secondary school students. Journal of School Psychology, 51, 469–485. https://doi.org/10.1016/j.jsp.2013.04.004

Good, C. P., McIntosh, K., & Gietz, C. (2011). Integrating bullying prevention into school wide positive behavior support. Teaching Exceptional Children, 44(1), 48–56. https://doi.org/10.1177/004005991104400106

Greenberg, M. T., Domitrovich, C. E., Graczyk, P. A., & Zins, J. E. (2005). The study of implementation in school-based preventive interventions: Theory, research, and practice: U.S: Department of Health and Human Services, Substance Abuse and Mental Health Services Administration, Centre for Mental Health Services (Vol. 3). Department of Health and Human Services.

Hellenic Ministry of Education and Religious Affair. (2021, February 18). Observatory of schools evaluation. http://aee.iep.edu.gr/about/philosophy  (In Greek)

Hinton, P., McMurray, I., & Brownlow, C. (2004). SPSS explained. Routledge. https://doi.org/10.4324/9780203642597

Holt, M. K., Kaufman, G., & Finkelhor, D. (2009). Parent/child concordance about bullying involvement and family characteristics related to bullying and peer victimization. Journal of School Violence, 8(1), 42-63.       https://doi.org/10.1080/15388220802067813

Honig, A., & Zdunowski-Sjoblom, N. (2014). Bullied children: Parent and school supports. Early Child Development and Care, 184(9-10), 1378–1402. https://doi.org/10.1080/03004430.2014.901010

Howitt, D., & Cramer, D. (2011). Introduction to research methods in psychology. Pearson/Prentice Hall.

Hymel, S., Schonert-Reichl, R. K., Bonanno, A., Vaillancourt, T., & Henderson, N. R. (2010). Handbook of bullying in schools. Ιn S. R Jimerson, S. M. Swearer & D. L. Espelage (Eds.), Bullying and Morality: Understanding How Good Kids Can Behave Badly (pp. 101-118). Routledge.

Ioannides, C. (2018). The relation between victimization, as a product of school violence, depression, anxiety, and self esteem of students in the 3^rd grade of lower secondary education and the 1^st grade of upper secondary education in the prefecture of Ioannina [Unpublished doctoral dissertation]. University of Ioannina.  (In Greek).

Κourkoutas, Η., & Xavier, L. (2017). Enhancing mental resilience in adolescents with academic and psychosocial difficulties/differences. School interventions. In H. Kourkoutas (Ed.), School counseling and interventions for children with needs (pp. 207-238). Pedio. (In Greek).

Kumpulainen, K., & Räsänen, E. (2000). Children involved in bullying at elementary school age: Their psychiatric symptoms and deviance in adolescence. Child Abuse & Neglect, 24(12), 1567–1577. https://doi.org/10.1016/S0145-2134(00)00210-6

Kyriakides, L., & Creemers, M. (2012). Characteristics of effective schools in facing and reducing bullying.  School Psychology International, 34(3), 348–368. https://doi.org/10.1177/0143034312467127

Lessne, D., & Yanez, C. (2016). Student reports of bullying: Results from the 2015 School Crime Supplement to the National Crime Victimization Survey. National Center for Education Statistics. https://nces.ed.gov/pubs2017/2017015.pdf

Limber, S. P., Nation, M., Tracy, A. J., Melton, G. B., & Flerx, V. (2004). Implementation of the Olweus bullying prevention program in the southeastern United States. In P. K. Smith, D. Pepler, & K. Rigby (Eds.), Bullying in schools: How successful can interventions be? (pp. 55–79). Cambridge University Press. https://doi.org/10.1017/CBO9780511584466.005

Lochman, J. E., Wells, K. C., Qu, L., & Chen, L. (2012). Three year follow-up of coping power intervention effects: Evidence of neighborhood moderation? Prevention Science, 14(4), 364–376. https://doi.org/10.1007/s11121-012-0295-0

Lund, I., Helgeland, A., & Kovac, B. V. (2015). Empirically based analysis of methodological and ethical challenges in research with children as participants: The case of bullying in kindergarten. Early Child Development and Care, 186(10), 1531–1543. https://doi.org/10.1080/03004430.2015.1110817

Murder of Alex Meschisvili. (2020, May 2). In Wikipedia. https://en.wikipedia.org/wiki/Murder_of_Alex_Meschisvili   

Nansel, T. R., Overpeck, M. D., Haynie, D. L., Ruan, W. J., & Scheidt, P. C. (2003). Relationships between bullying and violence among US youth. Archives of Pediatrics & Adolescent Medicine, 157(4), 348-353. https://doi.org/10.1001/archpedi.157.4.348

National Academies of Sciences, Engineering and Medicine. (2016). Preventing bullying through science, policy, and practice. The National Academies Press. https://doi.org/10.17226/23482

Nickerson, A. B. (2017). Preventing and intervening with bullying in schools: A framework for evidence-based practice. School Mental Health, 11(4) 1–14. https://doi.org/10.1007/s12310-017-9221-8

Nickerson, A. B., Singleton, D., Schnurr, B., & Collen, M. H. (2014). Perceptions of school climate as a function of bullying involvement. Journal of Applied School Psychology, 30(2), 157-181.  https://doi.org/10.1080/15377903.2014.888530

Olweus, D. (1993). Bullying at school: What we know and what we can do. Blackwell.

Ostrander, J., Melville, A., Bryan, J. K., & Letendre, J. (2018). Proposed modification of a school-wide bully prevention program to support all children. Journal of School Violence, 17(3), 367–380. https://doi.org/10.1080/15388220.2017.1379909

Pas, E. T., Waasdorp, T. E., & Bradshaw, C. P. (2018). Coaching Teachers to Detect, Prevent, and Respond to Bullying Using Mixed Reality Simulation: an Efficacy Study in Middle Schools. International Journal of Bullying Prevention. 1(1), 1-12.  https://doi.org/10.1007/s42380-018-0003-0    

Sackett, D. L., Rosenberg, W. M. C., Gray, J. A. M., Haynes, R. B., & Richardson, W. S. (1996). Evidence based medicine: what it is and what it isn’t. British Medicine Journal, 312(7023), 71–72.  https://doi.org/10.1136/bmj.312.7023.71 

Sheridan, S. M., Erchul, W. P., Brown, M. S., Dowd, S. E., Warnes, E. D., & Marti, D. C. (2004). Perceptions of helpfulness in conjoint behavioral consultation: Congruence and agreement between teachers and parents. School Psychology Quarterly, 19(2), 121–140. https://doi.org/10.1521/scpq.19.2.121.33308

Smith, J. D., Schneider, B., Smith, P. K., & Ananiadou, K. (2004). The effectiveness of whole- school anti-bullying programs: A synthesis of evaluation research. School Psychology Review, 33(4), 548–561. https://doi.org/10.1080/02796015.2004.12086267

Swearer, S. M., Grills, A. E., Haye, K. M., & Cary, P. T. (2004). Internalizing problems in students involved in bullying and victimization: Implications for intervention. In D. L. Espelage, & S. M. Swearer (Eds.), Bullying in American schools: A social-ecological perspective on prevention and intervention (pp. 63-84). Routledge.

Thornberg, R., Hunter, S. C., Hong, J. S., & Rönnberg, J. (2020). Bullying among children and adolescents. Scandinavian Journal of Psychology, 61(1), 1–5. https://doi.org/10.1111/sjop.12610

Totura, C. M. W., MacKinnon-Lewis, C., Gesten, E. L., Gadd, R., Divine, K. P., Dunham, S., & Kamboukos, D. (2009). Bullying and victimization among boys and girls in middle school: The influence of perceived family and schools contexts. Journal of Early Adolescence, 29(4), 571–609. https://doi.org/10.1177/0272431608324190

Ttofi, M., & Farrington, D. (2009). What works in preventing bullying: effective elements of anti‐bullying programmes. Journal of Aggression, Conflict and Peace Research, 1(1), 13-24. https://doi.org/10.1108/17596599200900003

Twemlow, S. W., Vernberg, E., Fonagy, P., Biggs, B. K., Nelson, J., M., & Sacco, F., C. (2009). A school climate intervention that reduces bullying by a focus on the bystander audience rather than the bully and victim. In S. R. Jimerson, S. M. Swearer, & D. L. Espelage (Eds.), Handbook of bullying in schools: An international perspective (pp. 365-776). Routledge.

Volk, A. A., Dane, A. V., & Marini, Z. A. (2014). What is bullying? A theoretical redefinition. Developmental Review, 34(4), 327–343. https://doi.org/10.1016/j.dr.2014.09.001

Von-Salisch, M. (2001). Children’s emotional development: Challenges in their relationships to parents, peers, and friends. International Journal of Behavioral Development, 25(4), 310–319. https://doi.org/10.1080/01650250143000058

Wilson, C. M., Douglas, K. S., & Lyon, D. R. (2010). Violence against teachers: Prevalence and consequences. Journal of Interpersonal Violence, 26(12), 2353–2371. https://doi.org/10.1177/0886260510383027

Yeager, D. S., Fong, C. J., Lee, H. Y., & Espelage, D. L. (2015). Declines in efficacy of anti-bullying programs among older adolescents: Theory and a three-level meta-analysis. Journal of Applied Developmental Psychology, 37(1), 36–51. https://doi.org/10.1016/j.appdev.2014.11.005

Zhang, J., Musu-Gillette, L., & Oudekerk, B. (2016). Indicators of school crime and safety: 2015 (NCES 2016-079/NCJ 249758). National Center of Educational Statistics. https://nces.ed.gov/pubs2016/2016079.pdf