Sipayung R, Sihotang DO, Lumban Batu JS. PERSEPSI GURU TERHADAP EFEKTIVITAS PEMBELAJARAN ONLINE DI MASA PANDEMI COVID-19. AQUINAS [Internet]. 2021Jul.7 [cited 2024Jul.22];4(2):311-2. Available from: https://ejournal.ust.ac.id/index.php/Aquinas/article/view/1307