APA (7th ed.) Citation

Lysing, H. (1936). Secret writing: An introduction to cryptograms, ciphers and codes. David Kemp & Company.

Chicago Style (17th ed.) Citation

Lysing, Henry. Secret Writing: An Introduction to Cryptograms, Ciphers and Codes. New York: David Kemp & Company, 1936.

MLA (9th ed.) Citation

Lysing, Henry. Secret Writing: An Introduction to Cryptograms, Ciphers and Codes. David Kemp & Company, 1936.