Pfiffner, J. P. (2005). The modern presidency (4th ed.). Thomson/Wadsworth.
芝加哥风格引文Pfiffner, James P. The Modern Presidency. 4th ed. Australia: Thomson/Wadsworth, 2005.
MLA引文Pfiffner, James P. The Modern Presidency. 4th ed. Thomson/Wadsworth, 2005.
警告：这些引文格式不一定是100％准确.