Kristianto, N. and Delvia, D. (2022) “LEVELS OF ONLINE LEARNING EFFECTIVENESS IN THE TIME OF THE COVID-19 PANDEMIC USING DIFFERENT APPLICATIONS LEARNING BY STUDENT’S PERCEPTION”, Epsilon: Jurnal Pendidikan Matematika, 3(1). Available at: https://jurnal.stkippgribl.ac.id/index.php/epsilon/article/view/583 (Accessed: 3 July 2024).