Barakat, N., L. Salameh, and M. Haidar. “The Effect of Immediate "verbal" and Deferred "visual verbal" Feedback in Improving the Beating Skill of Volleyball”. Tishreen University Journal -Medical Sciences Series, vol. 41, no. 6, Dec. 2019, https://journal.tishreen.edu.sy/index.php/hlthscnc/article/view/9353.