Olmedilla Zafra, Aurelio, Enrique Ortega, Manuel Ato, Francisco J. Lozano, Enrique Garcés de los Fayos, and Franciso J. Ortín. “Infringements of the Laws of the Game and Youth Soccer Categories: A Descriptive Study”. Journal of Human Sport and Exercise 5, no. 1 (January 21, 2010): 71–83. Accessed April 25, 2024. https://www.jhse.ua.es/article/view/2010-v5-n1-infringements-of-the-laws-of-the-game-and-youth-socce.