Yola, F., and M. Rifki. “PENGARUH LATIHAN SIRKUIT (CIRCUIT TRAINING) TERHADAPVOLUME OKSIGEN MAKSIMAL (VO2MAX) PEMAIN SEKOLAH SEPAK BOLA (SSB)”. JURNAL STAMINA, Vol. 3, no. 6, June 2020, pp. 509-26, http://stamina.ppj.unp.ac.id/index.php/JST/article/view/526.