SISWOYO, Siswoyo; YAFKI, Choirul; SULISTIANI, Indah. GRAMMATICAL ERROR ON STUDENTS’ RESEARCH PROPOSAL WRITING. Jurnal Smart, [S. l.], v. 9, n. 2, p. 82–93, 2023. DOI: 10.52657/js.v9i2.2082. Disponível em: https://ejournal.umpri.ac.id/index.php/smart/article/view/2082. Acesso em: 15 sep. 2026.