1. Family resemblances: studies in the internal structure of categories;Rosch;Cogn Psychol,1975
2. What some concepts might not be;Armstrong;Cognition,1983
3. Similarity, typicality, and categorization;Rips;In: Vosniadou S, Ortony A (eds). Similarity and analogical reasoning. New York: Cambridge University Press,1989
4. Keil FC. Concepts, kinds, and cognitive development. Cambridge: Bradford Books/MIT Press, 1989.
5. Medin DL, Ortony A. Psychological essentialism. In: Vosniadou S, Ortony A (eds). Similarity and analogical reasoning. New York: Cambridge University Press, 1989:179-95.