APA (7th ed.) Citation

Young, P., & Lawford, J. P. (1970). History of the British army. Barker.

Chicago Style (17th ed.) Citation

Young, Peter, and James Philip Lawford. History of the British Army. London: Barker, 1970.

MLA (9th ed.) Citation

Young, Peter, and James Philip Lawford. History of the British Army. Barker, 1970.