Papageorgiou Μ., Hassandra Μ., and Hatzigeorgiadis Α. “Fair Play in Physical Education: Effects of Sex, Age and Intrinsic Motivation”. Inquiries in Physical Education and Sport, vol. 6, no. 2, Nov. 2008, pp. 162-8, doi:10.26253/heal.uth.ojs.ispe.2008.1241.