MLA

Teixeira, António, et al. Computational Processing of the Portuguese Language. Springer Berlin Heidelberg, 2008.

APA

Teixeira, A., Lima, V. Lúcia Strube, Oliveira, L. Caldas, Quaresma, P., Siekmann, J., Caldas de Oliveira, L., & Strube de Lima, V. Lúcia. (2008). Computational Processing of the Portuguese Language. Springer Berlin Heidelberg.

Chicago

Teixeira, António, Vera Lúcia Strube Lima, Luís Caldas Oliveira, Paulo Quaresma, Jörg Siekmann, Luís Caldas de Oliveira, and Vera Lúcia Strube de Lima. Computational Processing of the Portuguese Language. : Springer Berlin Heidelberg, 2008.