Sihombing, Lisbet Novianti, and Prini Desima Evawani Ambarita. “The Effectiveness of Online Learning Through Google Classroom to Improve the Learning Achievement”. International Journal of Elementary Education 6, no. 2 (April 11, 2022): 341–349. Accessed February 21, 2025. https://ejournal.undiksha.ac.id/index.php/IJEE/article/view/45368.