APA (7th ed.) Citation

Smith, L. D. (1943). Cryptography: The science of secret writing. Norton.

Chicago Style (17th ed.) Citation

Smith, Laurence Dwight. Cryptography: The Science of Secret Writing. New York: Norton, 1943.

MLA (9th ed.) Citation

Smith, Laurence Dwight. Cryptography: The Science of Secret Writing. Norton, 1943.