“Development of a Microcontroller-Based Melinjo Tool As a Medium for Football Goalkeeper Reflex Training”. JISIP (Jurnal Ilmu Sosial dan Pendidikan) 10, no. 4 (November 1, 2026): 1668–1674. Accessed November 3, 2026. https://ejournal.mandalanursa.org/index.php/JISIP/article/view/11005.