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2. Cognitive Foundations of Natural History: Towards an Anthropology of Science;Atran,1990
3. Bacon, F. (1994) Novum Organum, trans. P. Urbach and J. Gibson (Chicago: Open Court). First published 1620.
4. Aristotle's Use of Division and Differentiae;Balme,1987
5. The Concept of the Genus;Bartlett;Bulletin of the Torrey Botanical Club,1940