APA (7th ed.) Citation

Purdue, A. W. (2015). The First World War. Palgrave Macmillan.

Chicago Style (17th ed.) Citation

Purdue, A. W. The First World War. New York: Palgrave Macmillan, 2015.

MLA (9th ed.) Citation

Purdue, A. W. The First World War. Palgrave Macmillan, 2015.