WINANS, Michael D. Busuu: A Social Network Application to Learn Languages. CALICO Journal, [S. l.], v. 37, n. 1, p. 117–126, 2020. DOI: 10.1558/cj.37781. Disponível em: https://journal.equinoxpub.com/Calico/article/view/17241.. Acesso em: 15 may. 2024.