Barbas, I., E. Bebetsos, K. Christos, D. Curby, and B. Mirzaei. “Investigation of Ego and Task Orientation Among International Wrestling Referees”. Physical Education of Students 20, no. 6 (December 12, 2016): 49–54. Accessed March 27, 2023. https://sportedu.org.ua/index.php/PES/article/view/338.