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A good survey piece is
- Robert Shaver (2010). Egoism (from the Stanford Encyclopedia of Philosophy)
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: