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| 1 | Myhrman, D.W., Sumerian Administrative Documents dated in the reigns of the Second Dynasty of Ur from the Temple Archives of Nippur, The Babylonian Expedition of the University of Pennsylvania III/1, Philadelphia 1910 |
| 2 | Hattori, A., Texts and Impressions: a Holistic Approach to Ur III Cuneiform Tablets from the University of Pennsylvania Expeditions to Nippur, Ph.D. Diss, University of Pennsylvania 2002 |
| 3 | Civil, M., The Farmer's Instructions. A Sumerian Agricultural Manual, Aula Orientalis - Supplementa 5, Sabadell 1994 |
| 4 | Wilcke, C., "Markt und Arbeit im Alten Orient am Ende des 3. Jahrtausends v.Chr.", W. Reinhard - J. Stagl (eds.), Menschen und Märkte. Studien zur historischen Wirtschaftsanthropologie, Veröffentlichungen des Insituts für Historische Anthropologie e.V., Vienna - Weimar - Köln 2007, pp. 71-121 |
| http://cdli.earth/P105592 |
| http://www.penn.museum/collections/object.php?irn=584499 |
| http://oracc.museum.upenn.edu/epsd2/P105592 |
| http://www.ebl.lmu.de/library/CBS.10256 |