RITONGA, M.; LAHMI, A.; SAPUTRA, R.; MURSAL; NOFRIZALDI, N. Online learning during the Covid-19 pandemic period: Studies on the social presence and affective and cognitive engagement of students. Pegem Journal of Education and Instruction, [S. l.], v. 12, n. 1, p. 207–212, 2022. DOI: 10.47750/pegegog.12.01.21. Disponível em: https://pegegog.net/index.php/pegegog/article/view/1466. Acesso em: 16 apr. 2025.