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| 1 | Snell, D.C. - Lager, C., Economic Texts from Sumer, Yale Oriental Series 18, New Haven - London 1991 |
| 2 | Mayr, R.H., "Intermittent Recarving of Seals in the Neo-Sumerian Period", W.W. Hallo - I.J. Winter, Seals and Seal Impressions. Proceedings of the XLVe Rencontre Assyriologique Internationale. Part II, Bethesda 2001, pp. 49-58 |
| 3 | Mayr, R.H., Seal Impressions on Tablets from Umma, 2005, unpubl. ms. |
| http://collections.peabody.yale.edu/search/Record/YPM-BC-002942 |
| http://oracc.museum.upenn.edu/epsd2/P142487 |
| http://www.ebl.lmu.de/library/Lager.36 |
| http://cdli.earth/P142487 |