Saprudin, Saprudin, Liliasari Liliasari, Andhy Setiawan, and Ary Setijadi Prihatmanto. “Optical Gamification (OG); Serial Versus Random Model to Improve Pre-Service Physics Teachers’ Concept Mastery”. International Journal of Emerging Technologies in Learning (iJET) 15, no. 09 (May 15, 2020): pp. 39–59. Accessed November 25, 2024. https://online-journals.org/index.php/i-jet/article/view/11779.