- E-bookThe Tragic Sense of LifeRobert J. Richards
- E-bookWas Hitler a Darwinian?Robert J. Richards
- E-bookThe Romantic Conception of LifeRobert J. Richards
- E-bookThe Meaning of EvolutionRobert J. Richards
- E-bookDarwin and the Emergence of Evolutionary Theories of Mind and BehaviorRobert J. Richards
- E-bookSéries: Science and Its Conceptual Foundations seriesLarry Laudan