Rahmi, Yulia, and Yanti Fitria. “The Development of Math-Integrated Light and Optical Instruments Teaching Materials Using the Problem-Based Learning Model”. International Journal of Educational Dynamics 1, no. 2 (June 1, 2019): 108-115. Accessed April 28, 2024. http://ijeds.ppj.unp.ac.id/index.php/IJEDS/article/view/101.