Sutiah,Supriyono. “Improvement of E-Learning Based On Hybrid Learning Methods At The University In The Era Of Industrial Revolution 4.0”. International Journal of Advanced Science and Technology 29, no. 6s (April 13, 2020): 2137-2142. Accessed May 2, 2024. http://sersc.org/journals/index.php/IJAST/article/view/10925.