List of serial killers by number of victims
Wayback Machine - Wikipedia
https://en.wikipedia.org/wiki/Wayback_MachineSerial Killers Macmillan Encyclopedia of Death and Dying - Find Articles
https://web.archive.org/web/20071105174409/http://findarticles.com/p/articles/mi_gx5214/is_2003/ai_n19132282FindArticles.com | CBSi
http://findarticles.com/p/articles/mi_gx5214/is_2003/ai_n19132282