Irish, Marian D.
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
Starling, Grover
The Dorsey Press, 1982
Buku Teks
McKenna, George
McGraw-Hill, 1998
Buku Teks
Shea, John C.
St. Martin's Press, 1984
Buku Teks