APA (7th ed.) Citation

Twigge, S. R. (2020). Codebreakers: Images of the National Archives. Pen & Sword History.

Chicago Style (17th ed.) Citation

Twigge, Stephen Robert. Codebreakers: Images of the National Archives. Barnsley, South Yorkshire, UK: Pen & Sword History, 2020.

MLA (9th ed.) Citation

Twigge, Stephen Robert. Codebreakers: Images of the National Archives. Pen & Sword History, 2020.

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