PROBLEMATIKA PEMBELAJARAN SAAT PANDEMI COVID-19 DI MADRASAH IBTIDAIYAH NURUL ULUM MERTAK TOMBOK. JISIP [Internet]. 2021 Jan. 10 [cited 2026 Sep. 18];5(1). Available from: https://ejournal.mandalanursa.org/index.php/JISIP/article/view/1700