The Poverty of the Linnaean Hierarchy: A Philosophical Study of Biological Taxonomy. Cambridge University Press 2001. Reprinted 2007. The Units of Evolution: Essays on the Nature of Species, MIT Press,
1992.
"Axiomatics and Individuality: A Reply to Mary Williams' 'Species Are Individuals'." Philosophy of Science, (1988), 55, pp. 427-434.
"The Semantic Approach to Evolutionary Theory." Biology and Philosophy, (1991), 5, pp. 7-28.
"Species, Higher Taxa, and the Units of Evolution." Philosophy of Science, (1991), 58, pp. 84-101.
"The Historical Nature of Evolutionary Theory." In Nitecki (ed.), History and Evolution, (1992), pp. 81-99, State University of New York Press.
"Eliminative Pluralism." Philosophy of Science, (1992), 59, pp. 671-690. Reprinted in D. Hull and M. Ruse (eds.), Philosophy of Biology , Oxford University Press (1998).
"Some Problems with the Linnaean Hierarchy", Philosophy of Science, (1994), 61. pp. 186-205.
"Critical Notice: John Dupre's The Disorder of Things," Canadian Journal of
Philosophy, (1995), 25, pp. 143-158.
"Pluralism, Normative Naturalism, and Biological Classification." In Hull and Burian (eds.), PSA 1994, (1995), Volume 2, pp. 382-389. Philosophy of Science Association.
"The Evolution of the Linnaean Hierarchy," Biology and Philosophy (1997), 12, pp. 493-519.
"Species Pluralism and Anti-Realism," Philosophy of Science (1998), 65, pp. 103-120.
"Species and the Linnaean Hierarchy." In R. Wilson (ed.), Species: New Interdisciplinary Essays," MIT Press, (1999), pp. 285-306.