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| 1 | Legrain, L., Business Documents of the Third Dynasty of Ur, Ur Excavations Texts 3, London 1937 |
| 2 | Steinkeller, P., "The Renting of Fields in Early Mesopotamia and the Development of the Concept of 'Interest' in Sumerian", Journal of the Economic and Social History of the Orient 24 (1981) 113-145 |
| http://cdli.earth/P137383 |
| http://www.ur-online.org/subject/5157/ |
| http://oracc.museum.upenn.edu/epsd2/P137383 |
| http://www.ebl.lmu.de/library/U.6001 |