APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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