SpringerLink (Online service) & Puppe, F. (1999). XPS-99: Knowledge-Based Systems - Survey and Future Directions: 5th Biannual German Conference on Knowledge-Based Systems, Würzburg, Germany, March 3-5, 1999, Proceedings (1st ed. 1999.). Springer Berlin Heidelberg : Imprint: Springer. https://doi.org/10.1007/b72142
Παραπομπή σε μορφή Chicago (17η εκδ.)SpringerLink (Online service) και Frank Puppe. XPS-99: Knowledge-Based Systems - Survey and Future Directions: 5th Biannual German Conference on Knowledge-Based Systems, Würzburg, Germany, March 3-5, 1999, Proceedings. 1st ed. 1999. Berlin, Heidelberg: Springer Berlin Heidelberg : Imprint: Springer, 1999. https://doi.org/10.1007/b72142.
Παραπομπή σε μορφή MLA (8th εκδ.)SpringerLink (Online service) και Frank Puppe. XPS-99: Knowledge-Based Systems - Survey and Future Directions: 5th Biannual German Conference on Knowledge-Based Systems, Würzburg, Germany, March 3-5, 1999, Proceedings. 1st ed. 1999. Springer Berlin Heidelberg : Imprint: Springer, 1999. https://doi.org/10.1007/b72142.
