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Kelley, David H. (1966). "A Cylinder Seal from Tlatilco". American Antiquity. 31 (5): 744–46. doi:10.2307/2694503. JSTOR2694503.
Kubler, George (1974). "Review of Picture Writing from Ancient Southern Mexico: Mixtec Place Signs and Maps". American Anthropologist. 76 (3): 670–672. doi:10.1525/aa.1974.76.3.02a00840. JSTOR674740.