APA (7th ed.) Citation

Duignan, B. (2011). Medieval philosophy: From 500 to 1500 CE. Britannica Educational Publishing.

Chicago Style (17th ed.) Citation

Duignan, Brian. Medieval Philosophy: From 500 to 1500 CE. New York: Britannica Educational Publishing, 2011.

MLA (9th ed.) Citation

Duignan, Brian. Medieval Philosophy: From 500 to 1500 CE. Britannica Educational Publishing, 2011.