Cita APA (7a ed.)

Richelson, J. T. (1995). 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. New York [u.a.]: Oxford University Press, 1995.

Cita MLA (8a ed.)

Richelson, Jeffrey T. A Century of Spies: Intelligence in the Twentieth Century. Oxford University Press, 1995.