http://www.zodiackiller.com/index.htm
http://www.crimelibrary.com/serial_killers/notorious/zodiac/river_1.html
http://www.biography.com/people/zodiac-killer-236027
http://www.examiner.com/article/zodiac-killer-s-identity-revealed-by-newly-discovered-evidence-cold-case
http://www.fbi.gov/news/stories/2007/march/zodiac_030207
http://www.crimelibrary.com/serial_killers/notorious/zodiac/river_1.html
http://www.biography.com/people/zodiac-killer-236027
http://www.examiner.com/article/zodiac-killer-s-identity-revealed-by-newly-discovered-evidence-cold-case
http://www.fbi.gov/news/stories/2007/march/zodiac_030207