The Ultra secret

MLA

Winterbotham, F. W. The Ultra Secret. 1st U.S. ed. New York: Harper & Row, 1974.

APA

Winterbotham, F. W. (1974). The Ultra secret. 1st U.S. ed. New York: Harper & Row.

Chicago

Winterbotham, F. W. The Ultra Secret. 1st U.S. ed. New York: Harper & Row, 1974.