CZIKO, Gary. Electronic Tandem Language Learning (eTandem): A Third Approach to Second Language Learning for the 21st Century. CALICO Journal, [S. l.], v. 22, n. 1, p. 25–39, 2013. DOI: 10.1558/cj.v22i1.25-39. Disponível em: https://journal.equinoxpub.com/Calico/article/view/17229.. Acesso em: 16 jul. 2024.