APA (7th ed.) Citation

Billingsley, R. (2009). Covert human intelligence sources: The "unlovely" face of police work. Waterside Press.

Chicago Style (17th ed.) Citation

Billingsley, Roger. Covert Human Intelligence Sources: The "Unlovely" Face of Police Work. Winchester: Waterside Press, 2009.

MLA (9th ed.) Citation

Billingsley, Roger. Covert Human Intelligence Sources: The "Unlovely" Face of Police Work. Waterside Press, 2009.