Cita APA (7th ed.)

Cookridge, E. H. (1972). Gehlen: Spy of the century / by E. H. Cookridge. Random House.

Cita Chicago (17th ed.)

Cookridge, E. H. Gehlen: Spy of the Century / by E. H. Cookridge. New York: Random House, 1972.

Cita MLA (8th ed.)

Cookridge, E. H. Gehlen: Spy of the Century / by E. H. Cookridge. Random House, 1972.