HUSSEIN, Mohammad Gheni. The Effect of Special Fartlek Style Exercises in Developing the Speed Endurance of First-Class Football Referees. Pubmedia Jurnal Pendidikan Olahraga, [S. l.], v. 1, n. 4, p. 8, 2024. DOI: 10.47134/jpo.v1i4.656. Disponível em: https://edu.pubmedia.id/index.php/jpo/article/view/656. Acesso em: 8 jun. 2025.