1 2 3 Trevor Bryce, The Routledge Handbook of The Peoples and Places of Ancient Western Asia: The Near East from the Early Bronze Age to the fall of the Persian Empire, Routledge, 2009, 738-739.
↑ Jerrold S. Cooper, History from Ancient Inscriptions: The Lagash-Umma Border Conflict, Undena, 1983, ISBN 0-89003-059-6
↑ P. A. Parr, A Letter of Ur-Lisi: Governor of Umma, Journal of Cuneiform Studies, vol. 24, no. 4, pp. 135-136, 1972
↑ William K. Loftus, Travels and Researches in Chaldaea and Susiana, Travels and Researches in Chaldaea and Susiana: With an Account of Excavations at Warka, the "Erech" of Nimrod, and Shush, "Shushan the Palace" of Esther, in 1849-52, Robert Carter & Brothers, 1857
↑ John P. Peters, Nippur; Or, Explorations and Adventures on the Euphrates: The Narrative of the University of Pennsylvania Expedition to Babylonia in the Years 1888–1890, University of Pennsylvania Babylonian Expedition, Putnam, 1897
↑ Georges Contenau, Contribution a l'Histoire Economique d'Umma, Librairie Champion, 1915
↑ Salah Salman Rumaidh, Excavations in Chokha: an Early Dynastic Settlement, Nabu, 2000, ISBN 978-1-897750-08-7
