Dwi Sulisworo, Dian Artha Kusumaningtyas, Trikinasih Handayani. 2020. “A Systematic Review: Student Focus on Online Learning Trends in Indonesia 2015-2020”. International Journal of Advanced Science and Technology 29 (05), 6964-87. http://sersc.org/journals/index.php/IJAST/article/view/18146.