Lehib Ahmed Shaker. “The Effect of a Psychological Counseling Program Using Motivation Techniques to Improve the Level of Some Defensive Skills in Volleyball”. Modern Sport 18, no. 1 (March 30, 2019): 131–140. Accessed April 2, 2025. https://jcopew.uobaghdad.edu.iq/index.php/sport/article/view/1610.