Arianto, Oktavian, and Dimyati. “During the COVID-19 Pandemic: Online or Offline Learning in Application of the Drill Method for Volleyball Services? ”. Innovare Journal of Education 10, no. 4 (July 1, 2022): 12–16. Accessed December 14, 2025. https://www.journals.innovareacademics.in/index.php/ijoe/article/view/44977.