Cita APA (7a ed.)

Knightley, P. (1987). The second oldest profession: Spies and spying in the twentieth century (1st American ed.). Norton.

Cita Chicago Style (17a ed.)

Knightley, Phillip. The Second Oldest Profession: Spies and Spying in the Twentieth Century. 1st American ed. New York [u.a.]: Norton, 1987.

Cita MLA (8a ed.)

Knightley, Phillip. The Second Oldest Profession: Spies and Spying in the Twentieth Century. 1st American ed. Norton, 1987.