Gardner, M. (1984). Codes, Ciphers and Secret Writing. Dover Publications.
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Citação norma Chicago
Gardner, Martin. Codes, Ciphers and Secret Writing. New York: Dover Publications, 1984.
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Citação norma MLA
Gardner, Martin. Codes, Ciphers and Secret Writing. Dover Publications, 1984.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.