[1]
Kusumadewi, H. 2018. 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). 7, 2 (Dec. 2018), 172–186. DOI:https://doi.org/10.15642/ijet2.2018.7.2.172-186.