CHAER, M. T.; AS’AD, M. A.; KHORIMAH , Q.; SUJARWANTO, E. Covid-19 Pandemic And Sustainability Study At Madrasah Ibtidaiyyah Pesantren Sabilil Muttaqien (PSM) Sulursewu, Teguhan, Ngawi, East Java. Jurnal Karya Abdi, v. 1, n. 2, p. 103-114, 22 Dec. 2020.