Barone, Michael, author
National Journal, 1990
Buku Referensi
McCarthy, Eugene J., 1916-2005, author
Macmillan, 1962
Buku Teks
Davis, David Howard, author
Nelson-Hall Publishers, 1999
Buku Teks
Irish, Marian D., author
Prentice-Hall, 1962
Buku Teks
edited by Pietro S. Nivola, David H. Rosenbloom ; with forewords by Nelson W. Polsby and Theodore J. Lowi
St. Martin's Press, 1990.
Buku Teks