sources

http://www.allserialkillers.com/zodiac_killer.htm

http://www.trutv.com/library/crime/serial_killers/notorious/zodiac/river_1.html

http://www.zodiackiller.com/AllenFile.html

http://www.zodiackillerfacts.com/allen.htm

http://www.angelfire.com/fl5/zodiac_law/CheriJoBates.html

http://www.opordanalytical.com/articles1/zodiac-340.htm

http://www.opordanalytical.com/articles/Zodiac2.htm