I have no clear idea, to be honest. It could have been a fictional book created just for the movie or a real book that was chosen to add a certain flavor to the scene. Without further research, it's hard to say for sure.
Sorry, I don't know. There are so many details in that movie, and keeping track of the specific book Travolta was reading isn't something I can recall off the top of my head. You might want to check some movie forums or dedicated fan sites for a more accurate answer.