Pfiffner, J. P. (2004). The character factor: How we judge America's presidents. Texas A & M University Press.
芝加哥风格引文Pfiffner, James P. The Character Factor: How We Judge America's Presidents. College Station, Tex.: Texas A & M University Press, 2004.
MLA引文Pfiffner, James P. The Character Factor: How We Judge America's Presidents. Texas A & M University Press, 2004.
警告：这些引文格式不一定是100％准确.