Lestari, Sri, Qori Aliarahmi, and Lastry Forsia. “The Use of Busuu Application to Improve Students? Vocabulary Mastery”. Foremost Journal 6, no. 2 (August 29, 2025): 191–198. Accessed July 18, 2026. https://ejournal.unis.ac.id/index.php/Foremost/article/view/7818.