SACAL, Patrick Glenn Y.; POTANE , Joel D. Students’ Mastery of English Grammar towards Effective Writing and Speaking Competence. International Journal of Multidisciplinary: Applied Business and Education Research, Malang, Indonesia, v. 4, n. 8, p. 2894–2904, 2023. DOI: 10.11594/ijmaber04.08.27. Disponível em: https://ijmaberjournal.org/index.php/ijmaber/article/view/1251. Acesso em: 23 jan. 2026.