Irfun, Irfun. 2024. “The Improving Legal Students’ Vocabulary by Using Duolingo at First Semester in Universitas Muhammadiyah Papua”. Tut Wuri Handayani : Jurnal Keguruan Dan Ilmu Pendidikan 3 (1):12-16. https://doi.org/10.59086/jkip.v3i1.1115.