RAHAYU, Pipit. THE ROLE OF ENGLISH VAGANZA COMPETITION 2016 ON CHALLENGING IMPROMTU SPEECH . JEE (Journal of English Education), [S. l.], v. 3, n. 1, p. 31–40, 2018. Disponível em: https://ojs-staging.upp.ac.id/index.php/JEE/article/view/504. Acesso em: 17 dec. 2025.