Gaya APA

The Codebreakers. (1973). New York: [s.n.].

Gaya Chicago

The Codebreakers. 1. New York: [s.n.], 1973. Text.

Gaya MLA

The Codebreakers. 1. New York: [s.n.], 1973. Text.

Gaya Turabian

The Codebreakers. New York: [s.n.], 1973. Print.