Febrianto, Priyono Tri, Siti Mas’udah, and Lutfi Apreliana Megasari. 2020. “Implementation of Online Learning During the Covid-19 Pandemic on Madura Island, Indonesia”. International Journal of Learning, Teaching and Educational Research 19 (8):233-54. https://ijlter.net/index.php/ijlter/article/view/271.