Ingrell, Joakim, Urban Johnson, and Andreas Ivarsson. “Achievement Goals in Youth Sport and the Influence of Coaches, Peers, and Parents: A Longitudinal Study”. Journal of Human Sport and Exercise 15, no. 3 (September 1, 2020): 570–590. Accessed May 4, 2024. https://www.jhse.ua.es/article/view/2020-v15-n3-achievement-goals-youth-sport-coaches-peers-parents-.