APA (7 वां संस्करण) प्रशस्ति पत्र
Abbott, P. (2011). The challenge of the American presidency: Washington to Obama (2nd ed.). Lexington Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Abbott, Philip. The Challenge of the American Presidency: Washington to Obama. 2nd ed. Lanham, Md.: Lexington Books, 2011.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Abbott, Philip. The Challenge of the American Presidency: Washington to Obama. 2nd ed. Lexington Books, 2011.
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