Rahayu, P. (2018) “THE ROLE OF ENGLISH VAGANZA COMPETITION 2016 ON CHALLENGING IMPROMTU SPEECH ”, JEE (Journal of English Education), 3(1), pp. 31–40. Available at: https://ojs-staging.upp.ac.id/index.php/JEE/article/view/504 (Accessed: 17 December 2025).