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| 1 | Legrain, L., Business Documents of the Third Dynasty of Ur, Ur Excavations Texts 3, London 1937 |
| 2 | Parpola, S., "The Assyrian Tree of Life: Tracing the Origins of Jewish Monotheism and Greek Philosophy”, Journal of Near Eastern Studies 52 (1993) 161-208 |
| http://bdtns.cesga.es/011385 |
| http://cdli.earth/P137405 |
| http://www.ur-online.org/subject/3877/ |
| http://www.britishmuseum.org/collection/search?museum_number=130360 |
| http://oracc.museum.upenn.edu/epsd2/P137405 |
| http://www.ebl.lmu.de/library/BM.130360 |