Wijaya, Alberik Ryan Tendy, Gracia Vica Ade Nugraheni, and Barli Bram. 2019. “GRAMMATICAL ERRORS IN UNDERGRADUATE STUDENTS’ RESEARCH PROPOSAL WRITING”. Jurnal Bahasa Lingua Scientia 11 (2):291-308. https://doi.org/10.21274/ls.2019.11.2.291-308.