http://www.ranker.com/list/famous-female-serial-killers/reference
http://www.nydailynews.com/news/thirteen-history-brutal-unforgiving-female-serial-killers-gallery-1.2894905?pmSlide=1.2894894
https://en.wikipedia.org/wiki/Elizabeth_B%C3%A1thory
http://www.history.com/this-day-in-history/bathorys-torturous-escapades-are-exposed
https://en.wikipedia.org/wiki/Miyuki_Ishikawa
http://www.absolutecrime.com/miyuki-ishikawa.html#.WX5PNITyuM8
http://murderpedia.org/female.B/b/barraza-juana.htm
https://en.wikipedia.org/wiki/Darya_Nikolayevna_Saltykova
https://en.wikipedia.org/wiki/H%C3%A9l%C3%A8ne_J%C3%A9gado
http://murderpedia.org/female.T/t/toppan-jane.htm
https://en.wikipedia.org/wiki/Jane_Toppan
https://en.wikipedia.org/wiki/Maria_Swanenburg
http://murderpedia.org/female.Z/z/zwanziger-anna.htm
https://en.wikipedia.org/wiki/Anna_Maria_Zwanziger
https://en.wikipedia.org/wiki/Karla_Homolka