Nguyen, Thi Hong Loan, and Quang Vinh Nguyen. “The Psychological State of 15-17 Year-Old Male Athletes of Ho Chi Minh City Vovinam Team before Competition”. Dong Thap University Journal of Science, no. 22 (October 22, 2016): 40–46. Accessed January 21, 2026. https://dthujs.vn/index.php/dthujs/article/view/756.