Syahruddin, S., Manfred Mandosir, Y., Eka Wijaya Putra, I. P., Sinaga, E. and Kristanto, B. (2021) “The effect of vitamin C supplementation on maximum physical activity toward leucocytes total”, Jurnal SPORTIF : Jurnal Penelitian Pembelajaran, 7(1), pp. 105-123. doi: 10.29407/js_unpgri.v7i1.15715.