APA (7th ed.) Citation

Douglas, D. C. (1964). William the Conqueror: The Norman impact upon England. University of California Press.

Chicago Style (17th ed.) Citation

Douglas, David Charles. William the Conqueror: The Norman Impact upon England. Berkeley: University of California Press, 1964.

MLA (9th ed.) Citation

Douglas, David Charles. William the Conqueror: The Norman Impact upon England. University of California Press, 1964.