Rahayu, Pipit. “THE ROLE OF ENGLISH VAGANZA COMPETITION 2016 ON CHALLENGING IMPROMTU SPEECH ”. JEE (Journal of English Education) 3, no. 1 (August 30, 2018): 31–40. Accessed December 17, 2025. https://ojs-staging.upp.ac.id/index.php/JEE/article/view/504.