APA (7th ed.) Citation

Winterbotham, F. W. (1999). The Ultra secret / F. W. Winterbotham. Weidenfeld & Nicolson.

Chicago Style (17th ed.) Citation

Winterbotham, F. W. The Ultra Secret / F. W. Winterbotham. London: Weidenfeld & Nicolson, 1999.

MLA (9th ed.) Citation

Winterbotham, F. W. The Ultra Secret / F. W. Winterbotham. Weidenfeld & Nicolson, 1999.

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