APA (7th ed.) Citation

Douglas, D. C. (1969). The Norman achievement, 1050-1100. University of California Press.

Chicago Style (17th ed.) Citation

Douglas, David Charles. The Norman Achievement, 1050-1100. Berkeley: University of California Press, 1969.

MLA (9th ed.) Citation

Douglas, David Charles. The Norman Achievement, 1050-1100. University of California Press, 1969.