Hajer Sahli, et al. “Comparative Effects of Teacher and Peer Verbal Encouragement on Psychological Responses During Physical Education Activities: A Randomized Controlled Crossover Study”. Revista De Psicología Del Deporte (Journal of Sport Psychology), vol. 34, no. 2, Sept. 2025, pp. 13-21, https://www.rpd-online.com/manuscript/index.php/rpd/article/view/1990.