Putra, K. D. P., and I. G. A. A. Wulandari. “Teacher’s Perceptions of Online Learning Activities During the Covid-19 Pandemic”. Jurnal Ilmiah Sekolah Dasar, vol. 5, no. 1, Mar. 2021, pp. 110-8, doi:10.23887/jisd.v5i1.32006.