MARTÍN-MOYA, R.; OGALLAR-BLANCO, A. I.; GARCÍA-MÁRMOL, E.; LIÑÁN-GONZÁLEZ, A.; GONZÁLEZ-FERNÁNDEZ, F. T. Differences Between U21 and U23 Semi-Professional Soccer Players in Perfectionism and Passion. Physical Education Theory and Methodology, [S. l.], v. 23, n. 4, p. 591–599, 2023. DOI: 10.17309/tmfv.2023.4.14. Disponível em: https://www.tmfv.com.ua/journal/article/view/2292. Acesso em: 11 jul. 2026.