These are a collection of books that we recommend to anyone interested in this field.
Guiley, Rosemary Ellen. The Encyclopedia of Ghosts and Spirits.
New York: Facts on File, 1992.
Kant, Immanuel. LOGIC. Trans. Robert S. Hartman, Wolfgang Schwartz.
New York: Dover, 1988.
Wood, Samuel E., and Wood, Ellen Green. The World of Psychology.
2nd ed. Needham Heights: Simon & Schuster, 1996.
Hawkings, Stephen. A Brief History of Time: The Updated Tenth Anniversary
Edition.New York: Bantam, 1998.
Herbert, Nick. Quanum Reality: Beyond the New Physics. New York:
Double Day, 1995.
Norman, Michael, and Beth Scott. Historic Haunted America. New York:
Tor, 1995.
Foreman, Laura, and John Gattuso eds. Discovery Travel Adventures:
Haunted Holidays. Singapore: APA, 1999.
Hauck, Dennis William. Haunted Places: The National Directory.
New York: Penguin, 1996.
Taylor, Troy. The Ghost Hunter's Guidebook.
  Alton: Whitechapel Productions Press, 1999.