JIANG, Xiangying; PETERS, Ryan; PLONSKY, Luke; PAJAK, Bozena. The Effectiveness of Duolingo English Courses in Developing Reading and Listening Proficiency. CALICO Journal, [S. l.], 2024. DOI: 10.1558/cj.26704. Disponível em: https://journal.equinoxpub.com/Calico/article/view/26704.. Acesso em: 17 sep. 2024.