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.
Atenció: Aquestes cites poden no estar 100% correctes.