Nelson, M. (2019). The evolving presidency: Landmark documents (Sixth edition.). SAGE/CQ Press.
芝加哥风格引文Nelson, Michael. The Evolving Presidency: Landmark Documents. Sixth edition. Thousand Oaks, California: SAGE/CQ Press, 2019.
MLA引文Nelson, Michael. The Evolving Presidency: Landmark Documents. Sixth edition. SAGE/CQ Press, 2019.
警告：这些引文格式不一定是100％准确.