Reference

Thomas B. Allen, Possessed: The True Story Of An Exorcism (New York: Doubleday July 1993, Bantam Books, April 1994)

LVCIFER (2011, February 16). The Entire Case History of Robbie Manheim: The Real-Life Story That Inspired "The Exorcist" Movie. Retrieved from http://diabolicalconfusions.wordpress.com/2011/02/16/the-story-of-r-the-real-life-story-that-inspired-the-exorcist/

William Peter Blatty (1974) William Peter Blatty On The Exorcist From Novel To Film (New York: Bantam Books, 1974).

Peter Travers and Stephanie Reiff, The Story Behind The Exorcist (New York: Signet Books, 1974).

Ellis. B (2000) Raising the devil: Satanism, new religions, and the media. University Press of Kentucky. Retrieved from http://books.google.com.my/books?id=oLcqlypMCe8C&pg=PA65&dq=ouija++christian&cd=7&redir_esc=y#v=onepage&q=ouija%20%20christian&f=false

Cinema of the occult: new age, satanism, Wicca, and spiritualism in film. Rosemont Publishing & Printing Corp. December 31, 2008. Retrieved from http://books.google.com.my/books?id=LylaC3ZxSbAC&pg=PA130&dq=Robbie+Mannheim&cd=3&redir_esc=y#v=onepage&q=Robbie%20Mannheim&f=false

Ascher, Rebecca (July 23, 1999). "Entertainment Weekly, "The 25 Scariest Movies of All Time". Retrieved from http://www.ew.com/ew/article/0,,272478,00.html

Barnes, Mike (December 28, 2010). "'Empire Strikes Back,' 'Airplane!' Among 25 Movies Named to National Film Registry". The Hollywood Reporter. Retrieved from http://www.hollywoodreporter.com/news/empire-strikes-airplane-25-movies-65915

Mark Opsasnick (December 31, 2007). The Cold Hard Facts Behind the Story that Inspired "The Exorcist" Strange Magazine. Retrieved from http://www.strangemag.com/exorcistpage5.html

Associated Press (March 9, 2005). Jesuit Priest Walter Halloran.  The Washington Post. Retrieved from http://www.washingtonpost.com/wp-dyn/articles/A18767-2005Mar8.html