Kaplan, R. D. (2017). Earning the Rockies: How geography shapes America's role in the world (First edition.). Random House.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKaplan, Robert D. Earning the Rockies: How Geography Shapes America's Role in the World. First edition. New York: Random House, 2017.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKaplan, Robert D. Earning the Rockies: How Geography Shapes America's Role in the World. First edition. Random House, 2017.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.