Sources
http://www.exorcismus.org/exorcism-and-exorcists/212-who-is-an-exorcist
http://www.stpeterslist.com/11/6-types-of-extraordinary-demonic-activity/
http://voices.yahoo.com/about-demonic-possession-people-become-possessed-2180828.html
http://fspp.net/warn%20poss.htm
http://www.examiner.com/article/demonology-101-why-do-people-become-possessed
http://www.ewtn.com/library/NEWAGE/EXORDEV.HTM
http://www.stpeterslist.com/11/6-types-of-extraordinary-demonic-activity/
http://voices.yahoo.com/about-demonic-possession-people-become-possessed-2180828.html
http://fspp.net/warn%20poss.htm
http://www.examiner.com/article/demonology-101-why-do-people-become-possessed
http://www.ewtn.com/library/NEWAGE/EXORDEV.HTM