- Life: An Unauthorised Biography: A Natural History of the First Four Thousand Million Years of Life on Earth
- What's God Got to Do with It? Robert Ingersoll on Free Thought, Honest Talk and the Separation of Church and State
- Some Mistakes of Moses
- Best of Robert Ingersoll: Selections from His Writings and Speeches
- The Works of Robert G. Ingersoll; Volume 1
- Gillian Chapman
- Nicholas Hankinson
- Linda G. Wilder Dyer
- James A. Haught
- Ali Ward
- Ten Pound Book
- George Horace Lorimer
- Liz Eaton
- Paul Colin
- Kelly Snelling
- Deborah Lippman
- Yvonne M. Padilla
- William Edelen
- Kate McKinnon
- Jo Logan
- Davidson Loehr
- Mirza Ghulam Ahmad
- Howard P. Hudson
- Alfredo J. Morales
- Ruth Ray