SpringerLink (Online service), Ling, T. W., & Ram, S. (1998). Conceptual Modeling - ER '98: 17th International Conference on Conceptual Modeling, Singapore, November 16-19, 1998, Proceedings (1st ed. 1998.). Springer Berlin Heidelberg : Imprint: Springer. https://doi.org/10.1007/b68220
Παραπομπή σε μορφή Chicago (17η εκδ.)SpringerLink (Online service), Tok Wang Ling, και Sudha Ram. Conceptual Modeling - ER '98: 17th International Conference on Conceptual Modeling, Singapore, November 16-19, 1998, Proceedings. 1st ed. 1998. Berlin, Heidelberg: Springer Berlin Heidelberg : Imprint: Springer, 1998. https://doi.org/10.1007/b68220.
Παραπομπή σε μορφή MLA (8th εκδ.)SpringerLink (Online service), et al. Conceptual Modeling - ER '98: 17th International Conference on Conceptual Modeling, Singapore, November 16-19, 1998, Proceedings. 1st ed. 1998. Springer Berlin Heidelberg : Imprint: Springer, 1998. https://doi.org/10.1007/b68220.
