Sopamena , Patma, Kapraja Sangadji, Dinar Riaddin, Syafruddin Kaliky, and Gamar Assagaf. 2023. “Effectiveness of Flipped Classroom Model on Mathematics Achievement at the University Level: A Meta-Analysis Study”. International Journal of Instruction 16 (1):767-80. https://e-iji.net/ats/index.php/pub/article/view/231.