Two books on evolutionary selection for moral realism:
The Evolution of Morality
Primates and Philosophers: How Morality Evolved
A good article on the structure of evolutionary debunking arguments in ethics (sorry, gated):
http://onlinelibrary.wiley.com/doi/10.1111/j.1468-0068.2010.00770.x/abstract
I would add The Science of Good and Evil
Two books on evolutionary selection for moral realism:
The Evolution of Morality
Primates and Philosophers: How Morality Evolved
A good article on the structure of evolutionary debunking arguments in ethics (sorry, gated):
http://onlinelibrary.wiley.com/doi/10.1111/j.1468-0068.2010.00770.x/abstract
I would add The Science of Good and Evil