http://www.theatlantic.com/past/docs/issues/2000/06/chase2.htm
http://murderpedia.org/male.C/c1/cole-carroll-edward.htm
http://www.casebook.org/ripper_letters/
https://en.wikipedia.org/wiki/H._H._Holmes
http://www.biography.com/people/andrew-cunanan-10239091#synopsis
http://www.vanityfair.com/magazine/1997/09/cunanan199709
https://en.wikipedia.org/wiki/Zodiac_Killer
http://archive.seattleweekly.com/2013-01-23/news/israel-keyes-in-plane-sight/
http://www.biography.com/people/edmund-kemper-403254
http://maamodt.asp.radford.edu/Psyc%20405/serial%20killers/Bundy,%20Ted%20-%202005.pdf
http://www.telegraph.co.uk/news/worldnews/northamerica/usa/7325048/US-serial-killer-Rodney-Alcala-could-be-new-Ted-Bundy.html