najem aljoubory, jameel. “Self-Confidence and Its Relationship to Competitive Behavior Among Female the Volleyball Players In the Kurdistan Region”. College of Basic Education Research Journal 20, no. 1 (March 1, 2024): 551–567. Accessed October 26, 2025. https://moss.uomosul.edu.iq/index.php/berj/article/view/39008.