SpringerLink (Online service), Liu, J., & Ye, Y. (2001). E-Commerce Agents: Marketplace Solutions, Security Issues, and Supply and Demand (1st ed. 2001.). Springer Berlin Heidelberg : Imprint: Springer. https://doi.org/10.1007/3-540-45370-9
Παραπομπή σε μορφή Chicago (17η εκδ.)SpringerLink (Online service), Jimingx Liu, και Yiming Ye. E-Commerce Agents: Marketplace Solutions, Security Issues, and Supply and Demand. 1st ed. 2001. Berlin, Heidelberg: Springer Berlin Heidelberg : Imprint: Springer, 2001. https://doi.org/10.1007/3-540-45370-9.
Παραπομπή σε μορφή MLA (8th εκδ.)SpringerLink (Online service), et al. E-Commerce Agents: Marketplace Solutions, Security Issues, and Supply and Demand. 1st ed. 2001. Springer Berlin Heidelberg : Imprint: Springer, 2001. https://doi.org/10.1007/3-540-45370-9.
