| Bibliography |  Suggestions |
| 1 | Gomi, T. - Yıldız, F., Die Umma-Texte aus den Archäologischen Museen zu Istanbul. Band IV (Nr. 2301-3000), Bethesda 1997 |
| 2 | Englund, R.K., "Equivalency Values and the Command Economy of the Ur III Period in Mesopotamia", J. K. Papadopoulos - G. Urton (eds.), The Construction of Value in the Ancient World, Los Angeles 2012, pp. 427-458 |
| http://oracc.museum.upenn.edu/epsd2/P140579 |
| http://cdli.mpiwg-berlin.mpg.de/P140579 |