Hassan Qader, Azad, and أزاد. “The Level of Positive Thinking and Its Relationship With the Accuracy of Defensive Performance for the Free Player in Volleyball”. Al-Rafidain Journal For Sport Sciences (RJSS) 20, no. 64: 122–139. Accessed September 17, 2025. https://ojs.uomosul.edu.iq/index.php/rjss/article/view/35739.