Suhairi, Muhammad, Zainal Arifin, and Syaparudin. “Innovative Volleyball Training Tool: AcuSpike Drill With Android Sound Reactions”. Journal Sport Area 9, no. 2 (July 25, 2024): 279–294. Accessed September 1, 2024. https://journal.uir.ac.id/index.php/JSP/article/view/12387.