Cita APA (7a ed.)
Gardner, M. (1984). Codes, Ciphers and Secret Writing. Dover Publications.
Cita Chicago Style (17a ed.)
Gardner, Martin. Codes, Ciphers and Secret Writing. New York: Dover Publications, 1984.
Cita MLA (9a ed.)
Gardner, Martin. Codes, Ciphers and Secret Writing. Dover Publications, 1984.
Precaución: Estas citas no son 100% exactas.