Ramadhanti, Revi Nur, and Azhar Azhar. “E-Module Validation Based on Contextual Teaching and Learning for High School Optical Instruments”. Journal of Natural Science and Integration 5, no. 2 (October 30, 2022): 237–246. Accessed July 9, 2025. https://dev-ojs.uin-suska.ac.id/index.php/JNSI/article/view/16982.