Pfiffner, J. P. (2004). The character factor: How we judge America's presidents. Texas A & M University Press.
Cita Chicago (17th ed.)Pfiffner, James P. The Character Factor: How We Judge America's Presidents. College Station, Tex.: Texas A & M University Press, 2004.
Cita MLA (9th ed.)Pfiffner, James P. The Character Factor: How We Judge America's Presidents. Texas A & M University Press, 2004.
Atenció: Aquestes cites poden no estar 100% correctes.