Moral sense / Charles Darwin
Ways of judging conduct / Herbert Spencer
Evolution and ethics / Thomas H. Huxley
Morality of the gene / Edward O. Wilson
Law of the jungle : moral alternatives and principles of evolution / J.L. Mackie
Biological interpretation of moral systems / R.D. Alexander
Hypothalmic imperative / P. Kitcher
Evolutionary ethics : a Phoenix arisen / M. Ruse
Defense of evolutionary ethics / R.J. Richards
Biological roots of morality / F.J. Ayala
Huxley's evolution and ethics in sociobiological perspective / George C. Williams
Biological justification of ethics : a best-case scenario / Alexander Rosenberg
Really taking Darwin seriously : an alternative to Michael Ruse's Darwinian metaethics / William A. Rottschaefer and David Martinsen
Evolutionary naturalism and the objectivity of morality / John Collier and Michael Stingl.