“Combination of Plyometric and Ladder Drill: Its Impact on Improving Speed, Agility, and Leg Muscle Power in Badminton”. Jurnal SPORTIF : Jurnal Penelitian Pembelajaran, vol. 9, no. 2, Aug. 2023, pp. 290-09, https://doi.org/10.29407/js_unpgri.v9i2.20468.