In Ghostbusters: Answer The Call Drs of particle physicists Abby Yates and Erin Gilbert wrote a book titled Ghosts From Our Past: Both Literally and Figuratively: A Study Of The Paranormal. (GBI Blog Post: December 19, 2015)
To tie into the new in-universe of Ghostbusters: Answer The Call, author Andrew Shaffer wrote the real book. Which had a hardback and more common (we think) paperback version. Its cover (probably because it had to) lets ghostheads know its a Ghostbusters: Answer The Call movie related book.
For most people that aren’t ghostheads that’s good enough. When you’re a ghosthead, good enough is well not good enough. That’s where the NYC Ghostbusters come in.
They created an original prop replica cover which can be used with the movie books or another book if one wanted to just display it among their collection.
Ghostheads can either download the regular cover or an oversized cover from the Ghosts From Our Past website.