Bibliografia Barker, Wayne G., ed. (1978). The History of Codes and Ciphers in the United States Prior to World War I. Gardner, Martin (1972). Codes, ciphers and secret writing. Kahn, David (1967). The Codebreakers. The Story of Secret Writing. Macmillan. Newton, David E. (1998). "Freemason's Cipher". Encyclopedia of Cryptology. Pratt, Fletcher (1939). Secret and Urgent: The story of codes and ciphers. Shulman, David; Weintraub, Joseph (1961). A glossary of cryptography. Crypto Press. Wrixon, Fred B. (1998). Codes, Ciphers, and other Cryptic & Clandestine Communication. Black Dog & Leventhal Publishers, Inc.
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Linki zewnętrzne http://www.ccelian.com/ElianScriptFull.html http://www.civilwarsignals.org/cipher/pigpencipher.html https://fontstruct.com/fontstructions/show/447940 http://cryptii.com/text/pigpen
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