Gönül Tekkurşun Demir. “DEVELOPING THE ATHLETE OPTIMISM AND PESSIMISM SCALE (AOPS): A VALIDITY AND RELIABILITY STUDY”. International Journal of Eurasia Social Sciences 13, no. 49 (September 1, 2022): 875–887. Accessed May 17, 2025. https://rrpubs.com/index.php/ijoess/article/view/1391.