Charles Schmid: The Pied Piper
John Gilmore, Cold-Blooded: The Saga of Charles Schmid, the Notorious "Pied Piper of Tucson" Portland, OR: Feral House, 1996. (Previously titled, The Tucson Murders in a 1970 Dial hardcover.)
Joyce Carol Oates, "Where Are You Going, Where Have You Been?" in Where are You Going, Where Have You Been?, edited by Elaine Showalter, New Brunswick, NJ, Rutgers University Press, 1994.
Don Moser, "The Pied Piper of Tucson," Life, March 4, 1966, 19-24, 80C-90C. (This article was the basis for a book of the same name by Moser.)
Brian Lane and Wilfred Gregg, The Encyclopedia of Serial Killers, New York, Berkley, (1992) 1995.
David Everett, Human Monsters: An Illustrated Encyclopedia of the World's Most Vicious Murderers. NY: Contemporary Books, 1993.