S. A.-D. D. . Awad, “Construction and Standardization of a Psychological Hardiness Scale for Employees of Sub-Federations in Volleyball”, KJPES, vol. 1, no. 8, pp. 204–222, Jan. 2026, Accessed: Aug. 13, 2026. [Online]. Available: https://journal.uokufa.edu.iq/index.php/kjpes/article/view/22993