SIAHAAN, Basar Lolo. The Effectiveness of Using Google Classroom for Self-Directed Learning (SDL) Students in Learning English. Jurnal Basicedu, [S. l.], v. 6, n. 3, p. 4282–4288, 2022. DOI: 10.31004/basicedu.v6i3.2841. Disponível em: https://jbasic.org/index.php/basicedu/article/view/2841. Acesso em: 1 jul. 2025.