The primary source for this piece was the coverage in the Philadelphia Inquirer, August 1985 – July 2000, along with supplements from the following books.
Mendoza, Antonio. Killers on the Loose: Unsolved Cases of Serial Murder. Revised and updated. Virgin, 2002.
Newton, Michael. Still at Large: A Casebook of Twentieth Century Serial Killers Who Eluded Justice. Loompanics Unlimited, 1999.
Newton, Michael. The Encyclopedia of Serial Killers. Checkmark, 2000.
Schechter, Harold. The Serial Killer Files. New York: Ballantine, 2003.