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
Ferguson, John H., author
McGraw-Hill, 1981
Buku Teks
Penniman, Howard R., author
D. Van Nostrand, 1962
Buku Teks