Kohl, Philip L.; Bäck, Lucien R.; Claessen, Henri J. M.; Gilman, Antonio; Hamlin, Christopher L.; Hayashi, Kensaku; Lamberg-Karlovsky, C. C.; Nissen, Hans J.; Oates, Joan (1978-09-01). "The Balance of Trade in Southwestern Asia in the Mid-Third Millennium B.C. [and Comments and Reply]". Current Anthropology. 19 (3): 463–492. doi:10.1086/202136. JSTOR2741769.
jstor.org
Kohl, Philip L.; Bäck, Lucien R.; Claessen, Henri J. M.; Gilman, Antonio; Hamlin, Christopher L.; Hayashi, Kensaku; Lamberg-Karlovsky, C. C.; Nissen, Hans J.; Oates, Joan (1978-09-01). "The Balance of Trade in Southwestern Asia in the Mid-Third Millennium B.C. [and Comments and Reply]". Current Anthropology. 19 (3): 463–492. doi:10.1086/202136. JSTOR2741769.