APA (7th ed.) Citation

Singular, S. (2006). Unholy messenger: The life and crimes of the BTK serial killer. Scribner.

Chicago Style (17th ed.) Citation

Singular, Stephen. Unholy Messenger: The Life and Crimes of the BTK Serial Killer. New York [u.a.]: Scribner, 2006.

MLA (8th ed.) Citation

Singular, Stephen. Unholy Messenger: The Life and Crimes of the BTK Serial Killer. Scribner, 2006.