- The Secret Commonwealth: An Essay of the Nature and Actions of the Subterranean (and, for the Most Part) Invisible People, Heretofioir Going under the Name of Elves, Fauns, and Fairies
- The Secret Commonwealth of Elves, Fauns and Fairies
- Relativism and Reality: A Contemporary Introduction
- Current Veterinary Therapy VII
- Robots, Zombies and Us: Understanding Consciousness