Spirits and Jinns

http://en.wikipedia.org/wiki/Spirit

http://www.newadvent.org/cathen/14220b.htm

http://en.wikipedia.org/wiki/Jinn

http://www.pantheon.org/articles/j/jinn.html

http://aliftheunseen.com/the-five-types-of-jinn/

http://www.islamreligion.com/articles/669/viewall/

http://www.islamawareness.net/Jinn/world.html

Of Interest

http://www.csicop.org/si/show/exorcism_driving_out_the_nonsense/
http://www.amazon.com/Trespass-Haunting-Christopher-M-Gibbons/dp/0578107716