Hussein Farhan Sheikh Ali, and Munadhil Adil Kasim. “THE EFFECT OF AN EDUCATIONAL CURRICULUM USING THE JIGSAW STRATEGY TO LEARNING SKILLS OF VOLLEYBALL FOR SECONDARY SCHOOL STUDENTS”. European Journal of Interdisciplinary Research and Development, vol. 9, Dec. 2022, pp. 160-8, https://ejird.journalspark.org/index.php/ejird/article/view/196.