APA (7th ed.) Citation

Twigge, S. R. (2020). Codebreakers: Images of the national archives. Pen & Sword History, an imprint of Pen & Sword Books Ltd.

Chicago Style (17th ed.) Citation

Twigge, Stephen Robert. Codebreakers: Images of the National Archives. Yorkshire ; Philadelphia: Pen & Sword History, an imprint of Pen & Sword Books Ltd, 2020.

MLA (8th ed.) Citation

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