SUCI OKTARINI, D. . The Effect Of Using Duolingo To Improve Students’ Vocabulary Mastery At The Eleventh Grade Students Of SMAN 5 Pinggir. Jolly Journal of English Education, [S. l.], v. 1, n. 2, p. 162–176, 2023. DOI: 10.63435/jjee.v1i2.61. Disponível em: https://ejournal.staihwduri.ac.id/index.php/jjee/article/view/61. Acesso em: 15 jul. 2026.