Cita APA (7a ed.)

Porter, B. (1987). The origins of the vigilant state: The London Metropolitan Police Special Branch before the first world war (1. publ.). Weidenfeld and Nicolson.

Cita Chicago Style (17a ed.)

Porter, Bernard. The Origins of the Vigilant State: The London Metropolitan Police Special Branch Before the First World War. 1. publ. London: Weidenfeld and Nicolson, 1987.

Cita MLA (9a ed.)

Porter, Bernard. The Origins of the Vigilant State: The London Metropolitan Police Special Branch Before the First World War. 1. publ. Weidenfeld and Nicolson, 1987.