Siahaan, Desta Gloria, Maria Hendrika Kristen Indi Nahak, and Edmundus Bouk. 2024. “Duolingo Application As A Mean to Deepen Understanding of English Vocabulary by Students of English Educational Department Timor University”. Buletin Poltanesa 25 (2):208-16. https://doi.org/10.51967/tanesa.v25i2.3189.