Spragens, William C
University Press of America, 1979
Buku Teks
Nash, Bradley D
Center for the study of the Presidency, 1980
Buku Teks
Corwin, Edward S., author
New York University Press, 1956
Buku Teks
Rossiter, Clinton, 1917-1970, author
The American Library, 1960
Buku Teks
Michael Nelson
COP Press, 2000
Buku Teks