Ouyang, X., & Mínguez, V. (2013). Monetary role of silver and its administration in Mesopotamia during the Ur III period (c. 2112-2004 BCE): A case study of the Umma Province. Consejo Superior de Investigaciones Científicas.

Ouyang, Xiaoli, and Víctor Mínguez. Monetary Role of Silver and Its Administration in Mesopotamia During the Ur III Period (c. 2112-2004 BCE): A Case Study of the Umma Province. Madrid: Consejo Superior de Investigaciones Científicas, 2013.

Ouyang, Xiaoli, and Víctor Mínguez. Monetary Role of Silver and Its Administration in Mesopotamia During the Ur III Period (c. 2112-2004 BCE): A Case Study of the Umma Province. Consejo Superior de Investigaciones Científicas, 2013.