Tampubolon, Hotmaria, Farihah Farihah, Halida Hanim, and Halimul Bahri. “Development of Interactive E-Books for Production Unit Courses by Implementing a Hybrid Learning System ”. International Journal of Educational Research & Social Sciences 3, no. 6 (December 27, 2022): 2433–2440. Accessed April 13, 2026. https://ijersc.org/index.php/go/article/view/527.