| Bibliography |  Suggestions |
| 1 | Snell, D.C. - Lager, C., Economic Texts from Sumer, Yale Oriental Series 18, New Haven - London 1991 |
| 2 | Tsouparopoulou, C., The Ur III Seals Impressed on Documents from Puzriš-Dagān (Drehem), Heidelberger Studien zum Alten Orient 16, Heidelberg 2015 |
| http://collections.peabody.yale.edu/search/Record/YPM-BC-002967 |
| http://oracc.museum.upenn.edu/epsd2/P142411 |
| http://www.ebl.lmu.de/library/Lager.61 |
| http://cdli.earth/P142411 |