KUSUMADEWI, H. The Effects of Using Duolingo Towards Student’s Vocabulary Mastery (An Experiment of Junior High School Students at Omega Sains Institute). IJET (Indonesian Journal of English Teaching), [S. l.], v. 7, n. 2, p. 172–186, 2018. DOI: 10.15642/ijet2.2018.7.2.172-186. Disponível em: https://jurnalftk.uinsby.ac.id/index.php/IJET/article/view/124. Acesso em: 29 mar. 2024.