Hakim, Hikmad, and Nukhrawi Nawir. “The Effect of Isotonic Training and Isometric Training on Upper Passing Ability in the Game of Volleyball”. Journal of Sport Education, Coaching, and Health (JOCCA), vol. 5, no. 2, June 2024, pp. 100-8, doi:10.35458/jc.v5i2.2494.