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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 April 19, 2025. https://ejournal.ust.ac.id/index.php/Aquinas/article/view/1307.