APA (7th ed.) Citation

Partridge, E., & Clark, J. W. (1951). British and American English since 1900. A. Dakers.

Chicago Style (17th ed.) Citation

Partridge, Eric, and John W. Clark. British and American English Since 1900. London: A. Dakers, 1951.

MLA (9th ed.) Citation

Partridge, Eric, and John W. Clark. British and American English Since 1900. A. Dakers, 1951.