I have been looking into this issue that (many/most/all/etc) UFOs are caused by demons as seems to be said by JWs. Some time ago when I browsed this site I read a posting where someone recommended a book titled "The Dark Gods" by Roberts and Gilbertson (here is a link to the book at amazon.com: http://www.amazon.com/Dark-Gods-Anthony-Roberts/dp/009138771X).
Besides that one there are a couple of other books that I have checked (one of these is "Operation Trojan Horse" by John Keel and the other one is "A Guide to the Paranormal" by Magnus Raven). Both of these say the same thing although they approach this issue from different directions.
Looking at the Amazon reviews for "The Dark Gods" it looks like it also says the same thing but the book is out of print. So I was curious on if anyone would know what the authors based their conclusion on?