NUGRAHA, D. N. S.; SIMATUPANG, E. C. M.; SARI, P.; GUNAWAN, H.; DIANITA, D.; RUSYAN, S. Duolingo as an Artificial Intelligence Technology-Based Learning System in English. Jurnal Sinestesia, [S. l.], v. 13, n. 2, p. 1085–1089, 2023. Disponível em: https://www.sinestesia.pustaka.my.id/journal/article/view/419. Acesso em: 10 oct. 2026.