Varothai, Varutthaya, and Chanchai Bunchapattanasakda. “Development of Competencies Among Thailand Professional Football Clubs’ Sports Staff”. Jurnal Sains Sukan & Pendidikan Jasmani 9, no. 2 (December 28, 2020): 56–62. Accessed March 29, 2024. https://ejournal.upsi.edu.my/index.php/JSSPJ/article/view/3149.