Kahn, D. (1967). The codebreakers: The story of secret writing (First edition.). The Macmillan Company.
Lua i Stíl Chicago (17ú heag.)Kahn, David. The Codebreakers: The Story of Secret Writing. First edition. New York: The Macmillan Company, 1967.
Lua MLA (8ú heag.)Kahn, David. The Codebreakers: The Story of Secret Writing. First edition. The Macmillan Company, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.