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| 1 | Legrain, L., Business Documents of the Third Dynasty of Ur, Ur Excavations Texts 3, London 1937 |
| 2 | Civil, M., The Farmer's Instructions. A Sumerian Agricultural Manual, Aula Orientalis - Supplementa 5, Sabadell 1994 |
| 3 | 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 |
| 4 | Focke, K., Der Garten in neusumerischer Zeit, Alter Orient und Altes Testament 53, Münster 2015 |
| http://cdli.earth/P137741 |
| http://www.ur-online.org/subject/4098/ |
| http://www.britishmuseum.org/collection/search?museum_number=130440 |
| http://oracc.museum.upenn.edu/epsd2/P137741 |
| http://www.ebl.lmu.de/library/BM.130440 |