APA (7th ed.) Citation

Singular, S., & Sklar, A. (2006). Unholy messenger: The life and crimes of the btk serial killer (Unabridged.). Tantor Media.

Chicago Style (17th ed.) Citation

Singular, Stephen, and Alan Sklar. Unholy Messenger: The Life and Crimes of the Btk Serial Killer. Unabridged. Old Saybrook: Tantor Media, 2006.

MLA (8th ed.) Citation

Singular, Stephen, and Alan Sklar. Unholy Messenger: The Life and Crimes of the Btk Serial Killer. Unabridged. Tantor Media, 2006.

Warning: These citations may not always be 100% accurate.