Contactees: A History of Alien-human Interaction, New Page Books, 2009

Contributor to The Roswell Dig Diaries: (Sci Fi Declassified), by SCI FI Channel, William H. Doleman, Thomas J. Carey, Donald R. Schmitt, Bill Richardson, Mike McAvennie, Pocket Books, 2004

Coordinator of the International Roswell Initiative on Santilli’s Controversial Autopsy Movie: A Comprehensive Review

Cosmic Crashes: The Incredible Story Of The UFOs That Fell To Earth, Simon & Schuster, 1999

Cosmic Top Secret: America’s Secret UFO Program

Cosmic Voyage: A Scientific Discovery of Extraterrestrials Visiting Earth

Crash at Corona: The U.S. Military Retrieval and Cover-up of a UFO, Paragon, 1992

Crash: When UFOs Fall From the Sky: A History of Famous Incidents, Conspiracies, and Cover-Ups, New Page Books, 2010

Creator of the Crop Circle Cards and Guide Booklet

Close Extraterrestrial Encounters: Positive Experience with Mysterious Visitors, Wild Flower Press, 1994