Ferris, T. (2010). The science of liberty: Democracy, reason, and the laws of nature. Harper Perennial.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFerris, Timothy. The Science of Liberty: Democracy, Reason, and the Laws of Nature. Harper Perennial, 2010.
एमएलए (9वां संस्करण) प्रशस्ति पत्रFerris, Timothy. The Science of Liberty: Democracy, Reason, and the Laws of Nature. Harper Perennial, 2010.
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