HEIFT, Trude. Developing an Intelligent Language Tutor. CALICO Journal, [S. l.], v. 27, n. 3, p. 443–459, 2013. DOI: 10.11139/cj.27.3.443-459. Disponível em: https://journal.equinoxpub.com/Calico/article/view/17171.. Acesso em: 16 jul. 2024.