Digelidis Ν., Kamtsios Σ., and Theodorakis Ι. “Physical Activity Levels, Exercise Attitudes, Self-Perceptions, Nutritional Behaviors and BMI Type of 12-Years Children”. Inquiries in Physical Education and Sport, vol. 5, no. 1, Apr. 2007, pp. 27-40, doi:10.26253/heal.uth.ojs.ispe.2007.1176.