Gumartifa, Asti, and Indawan Syahri. “How Undergraduate Students Capture English Impromptu Speech Challenge”. Voices of English Language Education Society 6, no. 2 (October 31, 2022): 477–487. Accessed July 22, 2024. https://e-journal.hamzanwadi.ac.id/index.php/veles/article/view/6601.