Sivri, Soner, and Oğuz Özbek. “Opinions of Tennis Umpires on in-Service Education umpires<p≫Tenis Hakemlerinin hizmetiçi eğitimlerine ilişkin görüşleri”. Journal of Human Sciences 15, no. 4 (October 6, 2018): 1791–1806. Accessed May 16, 2024. https://www.j-humansciences.com/ojs/index.php/IJHS/article/view/4644.