APA (7th ed.) Citation

Potter, M., & Potter, A. (1945). The building of London. Penguin Books.

Chicago Style (17th ed.) Citation

Potter, Margaret, and Alexander Potter. The Building of London. West Drayton, Middlesex ; New York: Penguin Books, 1945.

MLA (9th ed.) Citation

Potter, Margaret, and Alexander Potter. The Building of London. Penguin Books, 1945.