Koenig, L. W. (1960). The invisible presidency. Rinehart.
Cita Chicago (17th ed.)Koenig, Louis William. The Invisible Presidency. New York: Rinehart, 1960.
Cita MLA (9th ed.)Koenig, Louis William. The Invisible Presidency. Rinehart, 1960.
Atenció: Aquestes cites poden no estar 100% correctes.