I've always thought Star Trek: The Motion Picture was an incredibly redundant and crappy name.
I liked it. It's prosaic, but also pretty much what the movie is.
First thing that came to mind. I'm sure I still have the Reeves-Stevens book on Phase II
around here somewhere, that was quite interesting to read (especially the scripts, such as "In Thy Image", that came with it).
Beyond that (and The Human Adventures
Beyond the Unknown
? The Visitor