Portuguese Conference on Artificial Intelligence Albufeira, Portugal, Barahona, P., Porto, A., & Pereira, L. M. (1991). EPIA '91: 5th Portuguese Conference on Artificial Intelligence, Albufeira, Portugal, October 1-3, 1991 : proceedings. Springer-Verlag.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Portuguese Conference on Artificial Intelligence Albufeira, Portugal, P. Barahona, A. Porto, và Luís Moniz Pereira. EPIA '91: 5th Portuguese Conference on Artificial Intelligence, Albufeira, Portugal, October 1-3, 1991 : Proceedings. Berlin ; New York: Springer-Verlag, 1991.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)Portuguese Conference on Artificial Intelligence Albufeira, Portugal, et al. EPIA '91: 5th Portuguese Conference on Artificial Intelligence, Albufeira, Portugal, October 1-3, 1991 : Proceedings. Springer-Verlag, 1991.