AGRIPINA FOMENI; CHAMELYA V.C SENE; ROZITA YUSNIATY LODO; TIMOTEUS AJITO; TIMOTEUS AJITO. Students’ Difficulties in Mastering English Vocabulary Using Duolingo at SMP IL Kapten Nasipanaf Kupang: Penelitian . Jurnal Pengabdian Masyarakat dan Riset Pendidikan, [S. l.], v. 4, n. 4, p. 26139–26142, 2026. DOI: 10.31004/jerkin.v4i4.6616. Disponível em: https://jerkin.org/index.php/jerkin/article/view/6616. Acesso em: 24 jun. 2026.