Primary investigators have yet to develop a standardized methodology.  Thus, these books vary in their ability to ascertain reliable information. 

Ann Andrews and Jean Ritchie.  Abducted: The True Tale of Alien Abduction in Rural England. London: Headline Book Publishing, 1998.

Anne Druffel.  The Tujunga Canyon Contacts.  Englewood Cliffs, NJ: Prentice Hall, 1980. 

Raymond E. Fowler.  The Allagash Abductions.  Tigard, OR: Wildflower Press, 1993. 

-----------------.  The Andreasson Affair. Englewood Cliffs, NJ: Prentice Hall, 1979.

-----------------.  The Andreasson Affair--Phase Two. Englewood Cliffs, NJ: Prentice Hall, 1982. 

------------------. The Watchers. New York: Bantam, 1990. 

Budd Hopkins.  Missing Time.  New York: Richard Marek Publishers, 1981. 

-----------------.   Intruders: The Incredible Visitations at Copley Woods.  New York: Random House, 1987. 

-----------------.  Witnessed: The Brooklyn Bridge Abductions. New York: Pocket Books, 1996. 

Budd Hopkins and Carol Rainey.  Sight Unseen.  New York: Atria Books, 2003.

David M. Jacobs.  Secret Life: Firsthand Accounts of UFO Abductions. New York: Simon & Schuster, 1992.

----------------.  The Threat.  New York: Simon & Schuster, 1998.

John E. Mack.  Abduction: Human Encounters with Aliens.  New York: Scribners, 1994. 

Karla Turner.  Taken. Roland, AK: Kelt Works, 1994.

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