APA (7th ed.) Citation

Winterbotham, F. W. (1976). The ultra secret. A Dell Book.

Chicago Style (17th ed.) Citation

Winterbotham, F. W. The Ultra Secret. [New York]: A Dell Book, 1976.

MLA (9th ed.) Citation

Winterbotham, F. W. The Ultra Secret. A Dell Book, 1976.

Warning: These citations may not always be 100% accurate.