Calatrava, James Andrew Ruanto. “Development and Evaluation of E–Learning Materials With Kotobee Application in Physical Science for Grade 11 Students”. International Journal of Multidisciplinary: Applied Business and Education Research 3, no. 10 (October 12, 2022): 1913-1920. Accessed April 24, 2025. https://ijmaberjournal.org/index.php/ijmaber/article/view/591.