APA (7th ed.) Citation

Duignan, B. (2010). Ancient philosophy: From 600 BCE to 500 CE. Britannica Educational Publishing.

Chicago Style (17th ed.) Citation

Duignan, Brian. Ancient Philosophy: From 600 BCE to 500 CE. New York: Britannica Educational Publishing, 2010.

MLA (9th ed.) Citation

Duignan, Brian. Ancient Philosophy: From 600 BCE to 500 CE. Britannica Educational Publishing, 2010.