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A good survey piece is

Explicit defenders of versions of Egoism are hard to find though there are some.

Elliott Sober and David Sloan Wilson's Unto Others: The Evolution and Psychology of Unselfish Behavior discusses both biological and psychological egoism and the relationship between the two.

  • Sober and Wilson (2000). Summary of: "Unto Others".
  • Wilson, Relationship of Biological and Psychological Altruism
  • This journal contains a number of short responses to Unto Others: link

  • A recent discussion of Sober and Wilson's argument that evolution would lead to motivational pluralism is: