APA (7th ed.) Citation

Oman, C. W. C. (1996). A history of the Peninsular War. Greenhill Books [etc.].

Chicago Style (17th ed.) Citation

Oman, Charles William Chadwick. A History of the Peninsular War. London [etc.]: Greenhill Books [etc.], 1996.

MLA (9th ed.) Citation

Oman, Charles William Chadwick. A History of the Peninsular War. Greenhill Books [etc.], 1996.