Ilmadi, Ilmadi, Ramzil Zarista, Aden Aden, and Gerry Sastro. “The Effectiveness of Online Learning for Mathematics Students During the Covid-19 Pandemic”. Jurnal Cendekia : Jurnal Pendidikan Matematika 4, no. 2 (November 21, 2020): 1273-1282. Accessed November 5, 2025. https://www.j-cup.org/index.php/cendekia/article/view/372.