3. Larry Bradley

https://www.upi.com/Sheriff-gets-anonymous-confession-to-fatal-shooting-of-hunter/20441389299249/
http://www.wowktv.com/archives/on-year-later-larry-bradley-s-murder-remains-a-mystery/865538995
http://www.wsaz.com/home/headlines/Gallia-Co-Sheriff-Receives-Anonymous-Letter-About-Deadly-Hunting-Shooting-238918691.html

2. Madge Kirby

http://www.old-merseytimes.co.uk/liverpooltragedy.html
http://carolinebunford.co.uk/sample-page/infamous-liverpool/the-lost-girls/
http://detectiveandrews.tripod.com/madge.html#
https://trove.nla.gov.au/newspaper/article/5185559
https://trove.nla.gov.au/newspaper/article/90421692
https://books.google.ca/books?id=begSDQAAQBAJ&lpg=PT18&dq=madge%20kirby%20murder&pg=PT18#v=onepage&q=madge%20kirby%20murder&f=false
http://www.liverpoolecho.co.uk/news/liverpool-news/echo-murder-files-30000-mourners-9022603

1.	Cheri Jo Bates

https://www.pe.com/2016/11/06/after-50-years-zodiac-hunters-police-still-seeking-cheri-jo-bates-killer/
https://books.google.ca/books?id=1sGRFUyJ9LcC&lpg=PA106&ots=T2tNZR3nH4&dq=Cheri%20Jo%20Bates%20anonymous&pg=PA107#v=onepage&q=Cheri%20Jo%20Bates%20anonymous&f=false
http://www.sfgate.com/bayarea/slideshow/The-Zodiac-Killer-166962/photo-14579067.php
https://www.pe.com/2013/11/30/riverside-co-ed8217s-1966-slaying-still-a-mystery/
https://en.wikisource.org/wiki/Zodiac_Killer_letters#April_30th_1967
http://www.zodiackiller.com
https://www.britannica.com/biography/Arthur-Leigh-Allen
https://books.google.ca/books?id=8Wm6fvRvEqIC&lpg=PA108&dq=leigh%20arthur%20allen&pg=PP1#v=onepage&q&f=false
http://www.history.com/news/history-lists/could-any-of-these-men-have-been-the-zodiac-killer
https://books.google.ca/books?id=hqgtyeQQLn8C&lpg=PA326&dq=leigh%20arthur%20allen&pg=PA321#v=onepage&q&f=false