Maratussholihah M, Lisan KH, Hikmah H. Developing English language material integrated with Duolingo App for young learners in UNU Yogyakarta English Club Program. J.Gen.Educ.Humanit. [Internet]. 2026 Feb. 19 [cited 2026 Apr. 17];5(1):1469–1486. Available from: https://journal-gehu.com/index.php/gehu/article/view/937