Perkos Σ., Barkoukis Β., and Androutsopoulos Π. “Effect of School Physical Education Motivational Climate on Students’ Enjoyment and Intentions: A Self- Determination Theory Approach”. Inquiries in Physical Education and Sport, vol. 13, no. 1, Apr. 2015, pp. 32-41, https://journals.lib.uth.gr/index.php/inquiries/article/view/1443.