Bigfoot researcher Autumn Williams wrote a book last year about a Bigfoot witness named "Mike," and his on-going interactions with a Bigfoot he called Enoch. Enoch is the title of that book.
The book has absolutely nothing to do with UFOs, but I'm mentioning her book here because of the points Williams makes concerning the witness-researcher dynamic. Aside from the fascinating story of Mike's encounters with a Sasquatch is the concurrent story of the researcher and witness paradigm and how it must be, at the very least, evaluated, if not changed altogether. So many times while reading Enoch I thought "just replace Bigfoot with UFO and the message is the same" in terms of how witnesses are often considered and treated, and the power dynamic between witness and researcher.
Even if you're not interested in Bigfoot, I recommend Enoch for those reasons.