APA (7th ed.) Citation

Duggan, C. (1963). Twelfth-century decretal collections and their importance in English history. University of London, Athlone Press.

Chicago Style (17th ed.) Citation

Duggan, Charles. Twelfth-century Decretal Collections and Their Importance in English History. [London]: University of London, Athlone Press, 1963.

MLA (9th ed.) Citation

Duggan, Charles. Twelfth-century Decretal Collections and Their Importance in English History. University of London, Athlone Press, 1963.