SpringerLink (Online service), Barahona, P., & Alferes, J. J. (1999). Progress in Artificial Intelligence: 9th Portuguese Conference on Artificial Intelligence, EPIA '99, Evora, Portugal, September 21-24, 1999, Proceedings (1st ed. 1999.). Springer Berlin Heidelberg : Imprint: Springer. https://doi.org/10.1007/3-540-48159-1
Παραπομπή σε μορφή Chicago (17η εκδ.)SpringerLink (Online service), Pedro Barahona, και Jose J. Alferes. Progress in Artificial Intelligence: 9th Portuguese Conference on Artificial Intelligence, EPIA '99, Evora, Portugal, September 21-24, 1999, Proceedings. 1st ed. 1999. Berlin, Heidelberg: Springer Berlin Heidelberg : Imprint: Springer, 1999. https://doi.org/10.1007/3-540-48159-1.
Παραπομπή σε μορφή MLA (8th εκδ.)SpringerLink (Online service), et al. Progress in Artificial Intelligence: 9th Portuguese Conference on Artificial Intelligence, EPIA '99, Evora, Portugal, September 21-24, 1999, Proceedings. 1st ed. 1999. Springer Berlin Heidelberg : Imprint: Springer, 1999. https://doi.org/10.1007/3-540-48159-1.
