Simmons, Sabrina and Estes, Zachary, 1973-. (2008) Individual differences in the perception of similarity and difference. Cognition, Vol.108 (No.3). pp. 781-795. ISSN 0010-0277

Hampton, James A., Estes, Zachary, 1973- and Simmons, Sabrina. (2007) Metamorphosis: essence, appearance, and behavior in the categorization of natural kinds. Memory & Cognition, Vol.35 (No.7). pp. 1785-1800. ISSN 0090-502X

Estes, Zachary, 1973-, Adelman, James S. and Simmons, S. Escaping snakes and acquiring cash : categorical processing of affective words. In: CogSci 2008 : 30th Annual Meeting of the Cognitive Science Society, Washington, USA, 23-26 Jul 2008. Published in: Proceedings of the 30th Annual Conference of the Cognitive Science Society