Ramdhani, I. and Subiyantoro, H. 2025. 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, 4 (Oct. 2025), 1635–1646. DOI:https://doi.org/10.58421/gehu.v4i4.720.