WU, Shaoqun; WITTEN, Ian H.; EDWARDS, Arthur Walter; NICHOLS, David M.; AQUINO, Raúl. A Digital Library of Language Learning Exercises. International Journal of Emerging Technologies in Learning (iJET), [S. l.], v. 2, n. 1, 2006. DOI: 10.3991/ijet.v2i1.15. Disponível em: https://online-journals.org/index.php/i-jet/article/view/15. Acesso em: 20 apr. 2024.