Martínez-Gallego , Rafael, and David Carrillo Molina. “The Influence of Non-Verbal Body Language on Sport Performance in Professional Tennis”. ITF Coaching & Sport Science Review 27, no. 79 (December 31, 2019): 34–37. Accessed April 16, 2024. https://itfcoachingreview.com/index.php/journal/article/view/83.