Novak, Dario, and Tijana Cirkovic. “Changes in Mood States During the Preparation Period of the world’s Top Junior Tennis Player”. ITF Coaching & Sport Science Review 23, no. 65 (April 30, 2015): 28–31. Accessed April 20, 2024. https://itfcoachingreview.com/index.php/journal/article/view/117.