| Bibliography |  Suggestions |
| 1 | Contenau, G., Umma sous la dynastie d'Ur, Paris 1916 |
| 2 | Steinkeller, P., "Corvée Labor in Ur III Times", S. Garfinkle - M. Molina (eds.), From the 21st Century BC to the 21st Century AD. Proceedings of the International Conference on Neo-Sumerian Studies Held in Madrid, July 22-24, 2010, Winona Lake 2013, pp. 347-424 |
| http://oracc.museum.upenn.edu/epsd2/P139577 |
| http://cdli.mpiwg-berlin.mpg.de/P139577 |