Assmer Al – Hayane, Mohammed, محمد, Khalid M. Dawood Al- Bana, خالد, Ahmed H. Ahmed Al-Sowedi, and احمد. ““ The Transfer of the Effect of Vertical and Inverted Vertical Learning by Using Learning Tools in Learning the Skill of Sstrike in Volley Ball”. Al-Rafidain Journal For Sport Sciences (RJSS) 14, no. 48 (June 24, 2025): 115–128. Accessed August 4, 2025. https://ojs.uomosul.edu.iq/index.php/rjss/article/view/10769.