"Besieged Slayer Talks with Reporter on Phone," Philadelphia Inquirer, Sept. 6, 1949.

Berger, Meyer.  "Veteran Kills 12 in Mad Rampage on Camden Street, The New York Times, Sept 6, 1949.

"Boy Escapes Unruh's Shots, Almost Suffocates in Closet," Philadelphia Inquirer, Sept 7, 1949. 

Di Marco, Roxy, "Slayer Missed his First Target," Philadelphia Inquirer, Sept. 6, 1949.

Douglas, John, Ann W. Burgess, Allen G. Burgess, and Robert K. Ressler.  Crime Classification Manual.  San Francisco: Jossey-Bass, 1992. 

Everitt, David.  Human Monsters: An Illustrated Encyclopedia of the World's Most Vicious Murderers.  New York: Contemporary Books, 1993.

"I ran Out of Bullets, Went Home," Killer Says," Philadelphia Inquirer, Sept. 6, 1949.

Jeffers, H. Paul. Who Stole Precious?  New York: St. Martin's Press, 1991.

"Killer 'Changed' by War Service," New York Times, Sept. 7, 1949.

Lane, Brian.  Chronicle of Twentieth Century Murder, Vol. II.  New York: Berkley, 1995.

Mass Murderers.  Time-Life Books, Alexandria, VA , 1992.

"Mad Camden Killer Spirited To State Asylum at Trenton," Philadelphia Inquirer, Sept 8, 1949.

"Madman Traces His Murder Path," Philadelphia Inquirer.  Sept 7, 1949.

"Mass Murder: An American Tragedy," American Justice, A&E Network, 1994.

"Mother Wanders off In Daze as She Sees Siege of Home," Philadelphia Inquirer, Sept, 7, 1949.

"Nation's First Mass Murder was the Top Story of Sept 6, 1949," Courier-Post, April 29, 2003.

Noll, Richard.  The Encyclopedia of Schizophrenia and the Psychotic Disorders, Second Edition, New York: Facts on File, 2000.

"Police Coordinate Stories of Killings," Philadelphia Inquirer.  Sept 6, 1949.

Ramsey, Ed.  "The Silent Life of the Incurable Howard Unruh."  The Trenton Times, May 4, 2003.

Scott, Gini Graham.  Homicide: One Hundred Years of Murder in America.  Los Angeles: Lowell House, 1998.

Smith, Wilfred.  "Mad Camden Veteran Shoots Twelve Dead, Wounds Four in Mass Murder Orgy," Philadelphia Inquirer, Sept. 6, 1949.   

Tomlinson, Gerald.  Murdered in Jersey.  New Brunswick, NJ: Rutgers University Press, 1997.

"Unruh's Church Shocked by News," Philadelphia Inquirer, Sept. 6, 1949.

"Unruh's Mother Faints When Told of Murders; Killer Guarded in Cell," Philadelphia Inquirer, Sept 9, 1949.

"Unruh Described as Good Soldier," Philadelphia Inquirer, Sept 7, 1949.

With special thanks to John Timpane, opinion page editor at the Philadelphia Inquirer.