edited by Robert E. DiClerico, Allan S. Hammock
McGraw-Hill, 1992
Buku Teks
Saffell, David C.
Little, Brown, 1984
Buku Teks
Irish, Marian D.
Prentice-Hall, 1965
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
Irish, Marian D.
Prentice-Hall, 1962
Buku Teks