Communion by Whitley Shrieber

In the mid-80s, Whitley Strieber wrote Communion: A True Story, an account of his disturbing personal encounter with strange-looking nonhumans he called "The Visitors." When published, the book became a bestseller, topping national nonfiction lists. Its gripping story & vivid writing have made it a favorite source for science fiction writers & filmmakers.
 
- Goodreads Summary