1Richard E. Neustadt, Prc'sidelztial Power and the Moderu Presidents: The Politicw of Leudership from Roosevclt to Reagan. Free Press: Revised edition (March 1, 1991).
2Gelman. Andrew, and Gary K ing. 1993. " Why are American Presidential Election Campaign Polls so Variable when Votes are so Predictable?." British Jozzmal of Polilical Science 23:409-451.
7Hammond, Bray. Banks and Polities in America.From the Revolulion to the Civil War. Reprint edition (August 12, 1991 ), Princeton: Princeton University Press.
8Ostrogorski, Moisei Detnocracy and the Pary System in the United States. (November 2, 2008). Charleston, SC: BiblioLife.
9Degregorio.William A, The Complete Book of U.S.PresidentsS, 8 edition (Atlgust 7. 2013), Fort Lee, N J: Barricade Books.