Gotthelf, A., & Lennox, J. G. (2011). Metaethics, egoism, and virtue: Studies in Ayn Rand's normative theory. University of Pittsburgh Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGotthelf, Allan, और James G. Lennox. Metaethics, Egoism, and Virtue: Studies in Ayn Rand's Normative Theory. Pittsburgh, Pennsylvania: University of Pittsburgh Press, 2011.
एमएलए (9वां संस्करण) प्रशस्ति पत्रGotthelf, Allan, और James G. Lennox. Metaethics, Egoism, and Virtue: Studies in Ayn Rand's Normative Theory. University of Pittsburgh Press, 2011.
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