Erdoğan, Ramadan, Korhan Kavuran, and Ayşegül Şimşek. “Examining the Relationship Between Mental Toughness and Anxiety Levels of Professional Volleyball Players”. Health Nexus 3, no. 4 (October 6, 2025): 1–11. Accessed December 5, 2025. https://www.journals.kmanpub.com/index.php/Health-Nexus/article/view/4311.