Joel Achenbach, Captured by Aliens: The Search for Life and Truth in a Very Large Universe. New York: Simon and Schuster, 1999.

Robert E. Bartholomew and George S. Howard, UFOs and Alien Contact: Two Centuries of Mystery. Amherst, NY: Prometheus, 1998.

William J. Birnes and Harold Burt, Unsolved UFO Mysteries: The World's Most Compelling Cases of Alien Encounter. New York: Warner, 2000.

Peter A. Campbell, Alien Encounters. Brookfield, CT: Millbrook Press, 2000.

Dolores Cannon, The Custodians: "Beyond Abduction." Huntsville, AR: Ozark Mountain Publishing, 1999.

Jerome Clark, The UFO Book: Encyclopedia of the Extraterrestrial. Detroit, MI: Visible Ink Press, 1998.

David Darling, The Extraterrestrial Encyclopedia: An Alphabetical Reference to All Life in the Universe. New York: Three Rivers Press, 2000.

Preston Dennett, Extraterrestrial Visitations: True Accounts of Contact. St. Paul: Llewellyn, 2001.

Hilary Evans, From Other Worlds: Aliens, Abductions and UFOs. Pleasantville, NY: Readers Digest, 1998.

Bill Fawcett, ed., Making Contact: A Serious Handbook for Locating...