Yulia, Erma, Benyamin Situmorang, and Binsar M Pakpahan. “Feasibility of Engineering Mechanics E-Modules Developed Using the Four-D Model”. Jurnal Penelitian Pendidikan IPA 10, no. 7 (July 25, 2024): 3805–3814. Accessed April 11, 2025. https://jppipa.unram.ac.id/index.php/jppipa/article/view/7692.