Gönül Tekkurşun Demir. DEVELOPING THE ATHLETE OPTIMISM AND PESSIMISM SCALE (AOPS): A VALIDITY AND RELIABILITY STUDY. IJOESS [Internet]. 2022 Sep. 1 [cited 2025 Jun. 8];13(49):875-87. Available from: https://rrpubs.com/index.php/ijoess/article/view/1391