Cita APA (7th ed.)

Richelson, J. (1995). A century of spies: Intelligence in the twentieth century. Oxford University Press.

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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