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Butterfield, Michael. “The Zodiac Killer: A Timeline.” HISTORY, 1 Sept. 2018, www.history.com/news/the-zodiac-killer-a-timeline.
John Philip Jenkins. “Zodiac Killer | American Serial Killer.” Encyclopædia Britannica, 8 Sept. 2017, www.britannica.com/biography/Zodiac-killer.
Ornes, Stephen. "Mathematicians Crack the Zodiac Killer's Cipher." Discover, vol. 43, no. 1, Jan. 2022, pp. 71–72. EBSCOhost, search.ebscohost.com/login.aspx?direct=true&db=a9h&AN=153888148&site=ehost-live&scope=site.
Rodelli, Mike "The Shocking True Identity of the Zodiac Killer." Kirkus Reviews, vol. 89, no. 19, Oct. 2021, p. N.PAG. EBSCOhost, search.ebscohost.com/login.aspx?direct=true&db=a9h&AN=152649112&site=ehost-live&scope=site.
Voigt, Tom. “ZODIAC KILLER .COM.” Zodiackiller.com, 1998, zodiackiller.com/.