FITRI, Yesa; MELANI, Melyann; ROZA, Veni; REFLINDA, Reflinda. The Effect Of Using Duolingo Application Toward Students’ Vocabulary Mastery At The Second Grade Of SMPN 1 Koto Besar. Innovative: Journal Of Social Science Research, [S. l.], v. 3, n. 2, p. 8265–8279, 2023. Disponível em: http://j-innovative.org/index.php/Innovative/article/view/1374. Acesso em: 7 oct. 2026.