Setiawan, R. and Farida, I. 2021. Implementation of Online Learning System When Covid-19 in The Republic of Tatarstan, Russia. Entita: Jurnal Pendidikan Ilmu Pengetahuan Sosial dan Ilmu-Ilmu Sosial. 3, 1 (Jun. 2021), 1-18. DOI:https://doi.org/10.19105/ejpis.v3i1.3864.