APA (7th ed.) Citation

Bielewicz, J. A. (1980). Secret languages: Communicating in codes and ciphers. Elsevier/Nelson Books.

Chicago Style (17th ed.) Citation

Bielewicz, Julian A. Secret Languages: Communicating in Codes and Ciphers. New York: Elsevier/Nelson Books, 1980.

MLA (9th ed.) Citation

Bielewicz, Julian A. Secret Languages: Communicating in Codes and Ciphers. Elsevier/Nelson Books, 1980.