In Evolution, cognition, and realism: Studies in evolutionary epistemology, pp. 1–19. 1990, "Levels of organization, downward causation, and the selection-theory approach to evolutionary epistemology". In: G. Greenberg and E. Tobach (Eds.), Theories of the evolution of knowing, pp. 1–17. Hillsdale, NJ: Lawrence Erlbaum. 1994, "How individual and face-to-face group selection undermine firm selection in organizational evolution". In J.A.C. Baum and J.V. Singh (Eds.) Evolutionary dynamics of organizations, pp. 23–38. New York: Oxford University Press. 2003, with Bickhard, M. H., "Variations in variation and selection: The ubiquity of the variation-and-selective-retention ratchet in emergent organizational complexity." In Foundations of Science, 8(3), 215–282. See also Campbell's Law Downward causation American philosophy Entitativity References External links Selection Theory Bibliography: by Gary A. Cziko and Donald T. Campbell Lehigh Memorial: at Lehigh University Obituary in the New York Times 1916 births 1996 deaths Ohio State University faculty 20th-century American psychologists American sociologists Cyberneticists University of Chicago faculty Northwestern University faculty Lehigh University faculty Social psychologists UC Berkeley College of Letters and Science alumni Presidents of the American Psychological Association 20th-century American writers 20th-century American philosophers People from Grass Lake, Michigan United States Navy personnel of World War II United States Navy reservists Members of the American Philosophical Society