APA (7th ed.) Citation

Barker, W. G. (1979). The history of codes and ciphers in the United States during the period between the World Wars. Aegean Park Press.

Chicago Style (17th ed.) Citation

Barker, Wayne G. The History of Codes and Ciphers in the United States During the Period Between the World Wars. Laguna Hills, California: Aegean Park Press, 1979.

MLA (9th ed.) Citation

Barker, Wayne G. The History of Codes and Ciphers in the United States During the Period Between the World Wars. Aegean Park Press, 1979.