Cita APA (7a ed.)

Richelson, J. T. (1997). A Century of Spies: Intelligence in the Twentieth Century. Oxford University Press.

Cita Chicago Style (17a ed.)

Richelson, Jeffrey T. A Century of Spies: Intelligence in the Twentieth Century. Oxford: Oxford University Press, 1997.

Cita MLA (9a ed.)

Richelson, Jeffrey T. A Century of Spies: Intelligence in the Twentieth Century. Oxford University Press, 1997.