Leemans (1960), pp. 48–54. Leemans, W.F. (1960). "Ur: Time of Rim-Sin". Foreign trade in the old Babylonian period as revealed by texts from southern Mesopotamia. Studia et Documenta ad Iura Orientis Antiqui Pertinentia. Vol. 6. Leiden, NL: E.J. Brill. pp. 36–55.