Pious, R. M. (1996). The presidency. Allyn and Bacon.
Cita Chicago (17th ed.)Pious, Richard M. The Presidency. Boston: Allyn and Bacon, 1996.
Cita MLA (9th ed.)Pious, Richard M. The Presidency. Allyn and Bacon, 1996.
Atenció: Aquestes cites poden no estar 100% correctes.