ISMAIL, Hamid; SAIFUL. Upgrade the Students’ Speaking Ability: Implementation of the Callan Method at the Second Grade Students High School. ETDC: Indonesian Journal of Research and Educational Review , [S. l.], v. 3, n. 2, p. 59–69, 2024. DOI: 10.51574/ijrer.v3i2.1386. Disponível em: https://etdci.org/journal/ijrer/article/view/1386. Acesso em: 24 apr. 2025.