Butler-Bowdon, T., & Pratt, S. (2013). 50 philosophy classics: Thinking, being, acting, seeing, profound insights and powerful thinking from fifty key books (Unabridged.). Ascent Audio.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रButler-Bowdon, Tom, और Sean Pratt. 50 Philosophy Classics: Thinking, Being, Acting, Seeing, Profound Insights and Powerful Thinking from Fifty Key Books. Unabridged. Rego Park: Ascent Audio, 2013.
एमएलए (8वां संस्करण) प्रशस्ति पत्रButler-Bowdon, Tom, और Sean Pratt. 50 Philosophy Classics: Thinking, Being, Acting, Seeing, Profound Insights and Powerful Thinking from Fifty Key Books. Unabridged. Ascent Audio, 2013.
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