|
| 1 | Legrain, L., Business Documents of the Third Dynasty of Ur, Ur Excavations Texts 3, London 1937 |
| 2 | Simkó, K., "Emery abrasive used in the lapidary craft of the Ur III period? Some further remarks on the stone ú-na4-gug and its Old Babylonian counterpart", Aula Orientalis 33 (2015) 141-155 |
| http://cdli.earth/P137592 |
| http://www.penn.museum/collections/object.php?irn=413370 |
| http://oracc.museum.upenn.edu/epsd2/P137592 |
| http://www.ebl.lmu.de/library/UM.47-29-366 |