Pinker, S. (2011). The better angels of our nature: Why violence has declined. Viking.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPinker, Steven. The Better Angels of Our Nature: Why Violence Has Declined. New York: Viking, 2011.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPinker, Steven. The Better Angels of Our Nature: Why Violence Has Declined. Viking, 2011.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.