Cita APA (7a ed.)

Smith, L. D. (1971). Cryptography: The science of secret writing. Dover Publications.

Cita Chicago Style (17a ed.)

Smith, Laurence Dwight. Cryptography: The Science of Secret Writing. New York: Dover Publications, 1971.

Cita MLA (9a ed.)

Smith, Laurence Dwight. Cryptography: The Science of Secret Writing. Dover Publications, 1971.