Amir, Mahir, and Riyadh Khaleel. “The Effect of Jigsaw Strategy on Learning Spiking in Volleyball for Sophomore Students”. Journal of Physical Education 34, no. 4 (December 28, 2022): 522–534. Accessed May 9, 2024. https://jcope.uobaghdad.edu.iq/index.php/jcope/article/view/1322.