Amanda, Vivi, and Andri Donal. “STUDENTS’ GRAMMATICAL ERROR IN DELIVERING THE IMPROMPTU SPEECH”. JEE (Journal of English Education) 5, no. 2 (December 2, 2019): 78–87. Accessed December 18, 2025. https://ojs-staging.upp.ac.id/index.php/JEE/article/view/564.