Fathoni, Anang, and Heri Retnawati. “Challenges and Strategies of Postgraduate Students in Online Learning During the Covid-19 Pandemic”. Jurnal Prima Edukasia 9, no. 2 (June 30, 2021): 233–247. Accessed January 12, 2026. https://journal.uny.ac.id/index.php/jpe/article/view/37393.