Dewi, R. Roro Vemmi Kesuma, et al. “E-Learning As Education Media Innovation Inthe Industrial Revolution and Education 4.0 Era”. The Journal of Contemporary Issues in Business and Government, vol. 27, no. 1, Feb. 2021, pp. 2868-80, http://www.cibgp.com/index.php/1323-6903/article/view/757.