Ratna Setyowati Putri, Agus Purwanto , Rudy Pramono, Masduki Asbari, Laksmi Mayesti Wijayanti, Choi Chi Hyun. “Impact of the COVID-19 Pandemic on Online Home Learning: An Explorative Study of Primary Schools in Indonesia”. International Journal of Advanced Science and Technology, Vol. 29, no. 05, May 2020, pp. 4809 -18, http://sersc.org/journals/index.php/IJAST/article/view/13867.