Cita APA (7th ed.)

Duignan & Brian. (2010). The 100 Most Influential Philosophers of All Time. Britannica Educational Publishing.

Cita Chicago (17th ed.)

Duignan i Brian. The 100 Most Influential Philosophers of All Time. New York: Britannica Educational Publishing, 2010.

Cita MLA (9th ed.)

Duignan i Brian. The 100 Most Influential Philosophers of All Time. Britannica Educational Publishing, 2010.