Karharman, Abdulselam, and Mehmet Bayansalduz. “INVESTIGATION OF THE EFFECT OF POSITIVE PERCEPTION AND MENTAL TOUGHNESS LEVELS ON MOTIVATION OF SUCCESS IN ELITE MOUNTAIN RUNNING ATHLETES”. Acta Scientiae Et Intellectus , vol. 6, no. 2, Apr. 2024, pp. 7-17, http://actaint.com/index.php/pub/article/view/198.