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| 1 | Legrain, L., Business Documents of the Third Dynasty of Ur, Ur Excavations Texts 3, London 1937 |
| 2 | Heimpel, W., "Twenty-Eight Trees Growing in Sumer", D.I. Owen (ed.), Garšana Studies, Cornell University Studies in Assyriology and Sumerology 6, Bethesda 2011, pp. 75-152 |
| http://cdli.earth/P137132 |
| http://www.ur-online.org/subject/3538/ |
| http://www.britishmuseum.org/collection/search?museum_number=130295 |
| http://oracc.museum.upenn.edu/epsd2/P137132 |
| http://www.ebl.lmu.de/library/BM.130295 |