Aulia, Jannatul, Yenita Roza, and Maimunah Maimunah. “Mathematics Online Learning During COVID-19 Pandemic: The Effectiveness of Online Learning at SMK Negeri 2 Tanah Putih”. Jurnal Math Educator Nusantara: Wahana Publikasi Karya Tulis Ilmiah di Bidang Pendidikan Matematika 7, no. 2 (November 20, 2021): 89-98. Accessed January 19, 2022. https://ojs.unpkediri.ac.id/index.php/matematika/article/view/15945.