Amarta, Muhammad Fajar, et al. “Level of Motor Skills of Students Participating in Extracurricular Football Activities at State Junior High School Negeri 1 Depok, Sleman Regency”. Indonesian Journal of Sport Management, vol. 5, no. 3, Aug. 2025, pp. 679-91, doi:10.31949/ijsm.v5i3.14666.