Mahyuddin, Reza, et al. “EFEK CIRCUIT TRAINING TERHADAP KAPASITAS VO2MAX SISWA EKSTRAKURIKULER SEPAKBOLA ”. Tadulako Journal Sport Sciences And Physical Education, vol. 9, no. 1, June 2021, pp. 1-7, doi:10.22487/tjsspe.v9i1.704.