Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (8a ed.)

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