KRISTIANTO, N.; DELVIA, D. 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, [S. l.], v. 3, n. 1, 2022. Disponível em: https://jurnal.stkippgribl.ac.id/index.php/epsilon/article/view/583. Acesso em: 3 jul. 2024.