The 1950 FBI Memo on Flying Saucers: A Cautionary Case Study in Intelligence Reporting
To the point
J. Edgar Hoover and Guy Hottel illustrate that dramatic UFO claims are unreliable, since the informant was anonymous, no one verified the story, and modern intelligence clearly states confidence levels to separate rumors from evidence.
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After the Flying Saucers Came: A Global History of the UFO Phenomenon
Greg Eghigian
The Extraterrestrial Species Almanac: The Ultimate Guide to Greys, Reptilians, Hybrids, and Nordics (MUFON)
Craig Campobasso
The invisible college
Jacques Vallee
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