Lidya Ayu Permatasari, Ventje Kalukar, and Ida Wardani. 2019. “An Analysis of Grammatical Errors in Writing Thesis Proposal of English Department Students in Mulawarman University in the Academic Year 2018/2019”. E3L: Journal of English Teaching, Linguistic, and Literature 2 (2), 60 - 64. https://doi.org/10.30872/e3l.v2i2.1994.