Liakou Ε., Digelidis Ν., Chatzigeorgiadis Α. and Papaioannou Α. (2010) “Self-Concept, Achievement Goals and Bullying in Physical Education”, Inquiries in Physical Education and Sport, 8(1), pp. 1–13. doi: 10.26253/heal.uth.ojs.ispe.2010.1340.