Duignan & Brian. (2010). The 100 Most Influential Philosophers of All Time. Britannica Educational Publishing.
Citace podle Chicago (17th ed.)Duignan a Brian. The 100 Most Influential Philosophers of All Time. New York: Britannica Educational Publishing, 2010.
Citace podle MLA (9th ed.)Duignan a Brian. The 100 Most Influential Philosophers of All Time. Britannica Educational Publishing, 2010.
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