Chaer, M. T., M. A. As’ad, Q. Khorimah, and E. Sujarwanto. “Covid-19 Pandemic And Sustainability Study At Madrasah Ibtidaiyyah Pesantren Sabilil Muttaqien (PSM) Sulursewu, Teguhan, Ngawi, East Java”. Jurnal Karya Abdi, Vol. 1, no. 2, Dec. 2020, pp. 103-14, doi:10.32520/karyaabdi.v1i02.1156.