Warmansyah, J., Puja Diandra, Enji Novita Sari, Adam Mudinillah, Suswati Hendriani, and Mazlina Che Mustafa. “Enhancing Early Childhood English Vocabulary: Teachers’ Perspectives on Optimizing the Duolingo Application”. Journal of English Education and Teaching, vol. 8, no. 1, Mar. 2024, pp. 33-45, doi:10.33369/jeet.8.1.33-45.