APA Style

Barker, W, G. (1979). The History of Codes and Ciphers in The United States During World War 1 (Pertama). California: Aegean Park Press.

MLA Style

Barker, Wayne, G.. "The History of Codes and Ciphers in The United States During World War 1". Pertama California: Aegean Park Press, 1979. Text.