Budi, D. R., Syafei, M., Kusuma, M. N. H., Suhartoyo, T., Hidayat, R., & Listiandi, A. D. (2020). The significance of exercise method on forehand and backhand groundstroke skills improvement in tennis. Jurnal SPORTIF : Jurnal Penelitian Pembelajaran, 6(1), 132-144. https://doi.org/10.29407/js_unpgri.v6i1.13920