SpringerLink (Online service), Gelfond, M., Leone, N., & Pfeifer, G. (1999). Logic Programming and Nonmonotonic Reasoning: 5th International Conference, LPNMR '99, El Paso, Texas, USA, December 2-4, 1999 Proceedings (1st ed. 1999.). Springer Berlin Heidelberg : Imprint: Springer. https://doi.org/10.1007/3-540-46767-X
Παραπομπή σε μορφή Chicago (17η εκδ.)SpringerLink (Online service), Michael Gelfond, Nicole Leone, και Gerald Pfeifer. Logic Programming and Nonmonotonic Reasoning: 5th International Conference, LPNMR '99, El Paso, Texas, USA, December 2-4, 1999 Proceedings. 1st ed. 1999. Berlin, Heidelberg: Springer Berlin Heidelberg : Imprint: Springer, 1999. https://doi.org/10.1007/3-540-46767-X.
Παραπομπή σε μορφή MLA (8th εκδ.)SpringerLink (Online service), et al. Logic Programming and Nonmonotonic Reasoning: 5th International Conference, LPNMR '99, El Paso, Texas, USA, December 2-4, 1999 Proceedings. 1st ed. 1999. Springer Berlin Heidelberg : Imprint: Springer, 1999. https://doi.org/10.1007/3-540-46767-X.
