UAPs, the Tic-Tac Incidents, and the Fermi Paradox: Observations, Explanations, and the Limits of Proof
To the point
Most unidentified aerial phenomena have earthly explanations or are unresolved due to limited data, and while alien life could exist, the evidence so far points to human technology and perceptual limits rather than proven visits.
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The Extraterrestrial Species Almanac: The Ultimate Guide to Greys, Reptilians, Hybrids, and Nordics (MUFON)
Craig Campobasso
Abduction: Human Encounters with Aliens
John E. Mack
In Plain Sight: An investigation into UFOs and impossible science
Ross Coulthart
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