Abduction: Human Encounters with Aliens | 
pickWritten by a Professor of Psychiatry who studied people who said they had encounters with alien beings, this is the outcome of him listening to their stories and taking them seriously.
It's a collection of various stories and regressions of people who claim to have been abducted.
There's a lot more to this book though, it goes deep psychologically and spiritually.
A must read if you're interested in this phenomena, it's the best one I've read.
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