Spek, Bert (R. J.) van der: Feeding Hellenistic Seleucia on the Tigris and Babylon. (Paper presented at Seventh International Conference on Urban History: European City in Comparative Perspective, Panteion University, Athens - Piraeus, Greece, 27-30 October 2004, Session: The Ancient City in a European Perspective: feeding the ancient city.) Viitattu 21.1.2021. (englanniksi)