Hidayatulloh, Mukhlis, Iskandar Wiryokusumo, and Djoko Adi Walujo. “Developing Electrical Circuits Flipbook Using Flip Builder”. International Journal for Innovation Education and Research 7, no. 2 (February 1, 2019): 124–134. Accessed May 3, 2024. https://scholarsjournal.net/index.php/ijier/article/view/1331.