Enzyklopädien

Story, Ronald, (2001), The Mammoth Encyclopedia of Extraterrestrial Encounters, New York, New American Library. Details

Baker, Alan, (1999), The Encyclopedia of Alien Encounters, London, Virgin. Details

Clark, Jerome, (1997), The UFO Book: Encyclopedia of the Extraterrestrial, Canton, MI, Visible Ink Press. Details

Clark, Jerome, (1996), High Strangeness: UFOs From 1960 Through 1979, Detroit, MI, Omnigraphics. Details

Clark, Jerome, (1992), The Emergence of a Phenomenon: UFOs From the Beginning Through 1959, Detroit, MI, Omnigraphics. Details

Spencer, John, (1991), The UFO Encyclopedia, London, Headline Book Publishing PLC. Details

Clark, Jerome, (1990), UFOs in the 1980s, Detroit, MI, Apogee Books. Details

Sachs, Margaret, (1980), The UFO Encyclopedia, New York, Putnam. Details

Story, Ronald (Hrsg.), (1980), The Encyclopedia of UFOs, New York, Doubleday. Details