Ali Hameed Ali Al-Zubaidi. 2025. “The Effect of Using Fartlek Training Method on Developing Speed, Strength Endurance, and Court Defense Skill Performance in Volleyball”. Jurnal Nakula : Pusat Ilmu Pendidikan, Bahasa Dan Ilmu Sosial 3 (3):329-37. https://doi.org/10.61132/nakula.v3i3.1837.