Khalil R, Mohameed J. The Effect of Teaching Program Using Balls Throwing Machine on the Accuracy of Performing Skill Spike in Volleyball for Beginners. jope [Internet]. 2015 Sep. 28 [cited 2024 May 2];27(3):1-17. Available from: https://jcope.uobaghdad.edu.iq/index.php/jcope/article/view/607