PRIHATINI, F.; UTAMI, W. B.; AULIA, F. .; FADILA, F. Problem Based Learning Assisted by Google Classroom on Conceptual Understanding Ability. English Focus: Journal of English Language Education, [S. l.], v. 5, n. 1, p. 29–41, 2021. DOI: 10.24905/efj.v5i1.121. Disponível em: https://englishfocus.upstegal.ac.id/index.php/efj/article/view/121. Acesso em: 19 apr. 2025.