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
Manley, John F., author
Macmillan, 1976
Buku Teks
Harris, Cyril M., author
W.W. Norton, 1998
Buku Referensi
Jensen, Merrill, author
Kriger, 1979
Buku Teks