KHOMARIYAH, Y.; EKOWIJAYANTO, M. Duolingo As a Digital Tool for Enhancing English As a Foreign Language (EFL) Speaking Proficiency at Zain Academy. RIGGS: Journal of Artificial Intelligence and Digital Business, [S. l.], v. 4, n. 2, p. 6482–6492, 2025. DOI: 10.31004/riggs.v4i2.1670. Disponível em: https://journal.ilmudata.co.id/index.php/RIGGS/article/view/1670. Acesso em: 17 apr. 2026.