M.Sudey, Ammer, and عامر. “The Effect of Using the Direct Mental Training Way in Developing Some Basic Skills in Volleyball”. Al-Rafidain Journal For Sport Sciences (RJSS) 13, no. 44: 183–204. Accessed September 17, 2025. https://ojs.uomosul.edu.iq/index.php/rjss/article/view/36225.