Here are some books I found at Amazon.com
I did a search, and picked several that sounded like they would be good sources of information on Ghosts, Hauntings, and other Paranormal subjects. If you get them through this site, Paranormal Happenings gets commission, which will make it possible for me to make this site better!
The Complete Idiot's Guide to Ghosts and Hauntings
The Field Guide to North American Hauntings
Ghosts, Hauntings and Mysterious Happenings
Hauntings : The World of Spirits and Ghosts
Living With Ghosts : True Tales of the Paranormal
True Hauntings : Spirits With a Purpose
The Encyclopedia of the Paranormal
Incredible Tales of the Paranormal :...
The Paranormal Investigator's Handbook
PSYCHIC ANIMALS: A FASCINATING INVESTIGATION OF PARANORMAL BEHAVIOR
Two Easy Steps