Hadi, Hasan, and Alaa Muhsin. “The Effect of Guided Discovery And Programed Teaching On Learning and Developing Kinematic Motor Form Of Spike In Volleyball”. Journal of Physical Education 31, no. 3 (September 28, 2019): 183–194. Accessed June 24, 2026. https://www.jcope.uobaghdad.edu.iq/index.php/jcope/article/view/873.