Ramdhani, Ilham, and Hariyanto Subiyantoro. “The Effect of the Duolingo App to Improve Vocabulary Mastery Among Gen-Z In an English Course Program”. Journal of General Education and Humanities 4, no. 4 (October 2, 2025): 1635–1646. Accessed June 30, 2026. https://journal-gehu.com/index.php/gehu/article/view/720.