Nelson, M. (2019). The evolving presidency: Landmark documents (Sixth edition.). SAGE/CQ Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNelson, Michael. The Evolving Presidency: Landmark Documents. Sixth edition. Thousand Oaks, California: SAGE/CQ Press, 2019.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNelson, Michael. The Evolving Presidency: Landmark Documents. Sixth edition. SAGE/CQ Press, 2019.
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