Irzawati, Ira, and Agnes Felisya Unamo. “Students’ Perceptions and Attitudes towards the Utilization of Duolingo in EFL Learning”. J-SHMIC : Journal of English for Academic, vol. 10, no. 2, Aug. 2023, pp. 123-38, doi:10.25299/jshmic.2023.vol10(2).13649.