APA (7th ed.) Citation

Somervell, D. C., & Harvey, H. J. (1954). The British Empire and Commonwealth. Christophers.

Chicago Style (17th ed.) Citation

Somervell, D. C., and Heather J. Harvey. The British Empire and Commonwealth. London: Christophers, 1954.

MLA (8th ed.) Citation

Somervell, D. C., and Heather J. Harvey. The British Empire and Commonwealth. Christophers, 1954.