HAMZAH ALIAS. Problem-Based Learning Model to Improve English Learning Achievement. ETDC: Indonesian Journal of Research and Educational Review , [S. l.], v. 2, n. 4, p. 102–110, 2023. DOI: 10.51574/ijrer.v2i4.1020. Disponível em: https://www.etdci.org/journal/ijrer/article/view/1020. Acesso em: 3 aug. 2025.