Sipayung, Regina, Din Oloan Sihotang, and Johannes Sohirimon Lumban Batu. “PERSEPSI GURU TERHADAP EFEKTIVITAS PEMBELAJARAN ONLINE DI MASA PANDEMI COVID-19”. Jurnal Ilmiah Aquinas 4, no. 2 (July 7, 2021): 311–321. Accessed July 22, 2024. https://ejournal.ust.ac.id/index.php/Aquinas/article/view/1307.