Having read through many, many different types of books on the paranormal, here are my suggestions for the best reading. We have even supplied a link to Amazon.com which has the best prices we have found so far.
The Ghost Hunter's Guidebook (The Essential Handbook for Ghost Research) by Troy Taylor
Ghost Stalker's Guide to Haunted California - Richard Senate
Haunted Nevada - Janice Oberding
Hollywood Haunted - Laurie Jacobson
The Paranormal Investigator's Handbook - Valerie Hope & Maurice Townsend
Hunting the Dead (Methods of Ghost Chasing) - Brian Roesch
Field Guide to Spirit Photography (The Essential Guide to Cameras in Paranormal Research) - Dale Kaczmarek
Ghosts of the Haunted Coast - Richard Senate
Living with Ghosts (True Tales of the Paranormal) - D.B. Fiedel
This is our list and it is still growing as we continue to read more.