The conclusion to the Ypsilanti Ripper also known as the Michigan Co-ed Murders from 1967-1969. 

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John Norman Collins | Murderpedia, the encyclopedia of murderers

Clippings from The Ann Arbor News, Ypsilanti Press, Detroit News, and Detroit Free Press, 1967-72.

John Norman Collins: The Co-Ed Killer: By Katherine Ramsland

The Michigan Murders, Edward Keyes (Pocket, 1976). 

 Killer among Us: Public Reaction to Serial Murder by Joseph C. Fisher.

Encyclopedia of Serial Killers by Brian Lane and Wilfred Gregg (Headline Books, 1992).

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