Selection. Cambridge MA: MIT Press. () Buss, Leo W. (1988) The Evolution of Individuality. () Williams, G. C. (1966) Adaptation and Natural Selection. Princeton University Press, Princeton. () Dawkins, Richard (1976; 1989; 2006) The Selfish Gene. Oxford University Press, Oxford. () Gould, Stephen Jay (2002) The Structure of Evolutionary Theory. Harvard University Press. Lloyd, Elisabeth (1988) The Structure and Confirmation of Evolutionary Theory, Greenwood Press (Reprinted Princeton University Press, 1994 ). Sober, Elliott (1984; 1993) The Nature of Selection: Evolutionary Theory in Philosophical Focus. The University of Chicago Press. Maynard Smith, J. Evolutionary Genetics. Oxford University Press, 1998. Okasha, S. (2006) Evolution and the levels of Selection. Oxford University Press. Bourrat, P. (2021) Facts, Conventions and the Levels of Selection. Cambridge University Press. External links Lloyd, Elisabeth, "Units and Levels of Selection." The Stanford Encyclopedia of Philosophy, (Fall 2005 Edition), Edward N. Zalta (ed.) Mayr, Ernst (1997). "The objects of selection Proc. Natl. Acad. Sci. USA 94 (March): 2091-94. Evolutionary biology Population genetics