Diningrat, Syaiputra Wahyuda Meisa, Punaji Setyosari, Saida Ulfa, and Utami Widiati. “Integrating PBI in the Flipped Classroom: A Framework for Effective Instruction”. World Journal on Educational Technology: Current Issues 12, no. 2 (April 30, 2020): 117–127. Accessed April 25, 2024. https://un-pub.eu/ojs/index.php/wjet/article/view/4662.