Sofian, M., I. . Ilham, and M. F. Bafadal. “Students Perception of Using the Duolingo Application in Mastering English Language Skills in an English Study Program”. Journal of English Culture, Language, Literature and Education, vol. 13, no. 2, July 2025, pp. 183-98, doi:10.53682/eclue.v13i2.11734.