| Bibliography |  Suggestions |
| 1 | Keiser, C.E., Selected Temple Documents of the Ur Dynasty, Yale Oriental Series 4, New Haven 1919 |
| 2 | Steinkeller, P., "Alleged GUR.DA = ugula-géš-da and the Reading of the Sumerian Numeral 60", Zeitschrift für Assyriologie 69 (1979) 176-187 |
| http://collections.peabody.yale.edu/search/Record/YPM-BC-016001 |
| http://oracc.museum.upenn.edu/epsd2/P142107 |
| http://www.ebl.lmu.de/library/YBC.1260 |
| http://cdli.earth/P142107 |