SpringerLink (Online service), Fiege, L., Mühl, G., & Wilhelm, U. (2001). Electronic Commerce: Second International Workshop, WELCOM 2001 Heidelberg, Germany, November 16-17, 2001. Proceedings (1st ed. 2001.). Springer Berlin Heidelberg : Imprint: Springer. https://doi.org/10.1007/3-540-45598-1
Παραπομπή σε μορφή Chicago (17η εκδ.)SpringerLink (Online service), Ludger Fiege, Gero Mühl, και Uwe Wilhelm. Electronic Commerce: Second International Workshop, WELCOM 2001 Heidelberg, Germany, November 16-17, 2001. Proceedings. 1st ed. 2001. Berlin, Heidelberg: Springer Berlin Heidelberg : Imprint: Springer, 2001. https://doi.org/10.1007/3-540-45598-1.
Παραπομπή σε μορφή MLA (8th εκδ.)SpringerLink (Online service), et al. Electronic Commerce: Second International Workshop, WELCOM 2001 Heidelberg, Germany, November 16-17, 2001. Proceedings. 1st ed. 2001. Springer Berlin Heidelberg : Imprint: Springer, 2001. https://doi.org/10.1007/3-540-45598-1.
