APA (7th ed.) Citation

Slocombe, R., & Steel, N. (2014). Posters of the First World War. Imperial War Museum.

Chicago Style (17th ed.) Citation

Slocombe, Richard, and Nigel Steel. Posters of the First World War. London: Imperial War Museum, 2014.

MLA (9th ed.) Citation

Slocombe, Richard, and Nigel Steel. Posters of the First World War. Imperial War Museum, 2014.

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