Viorst, Milton, author
Avon Book Division, 1963
Buku Teks
Irish, Marian D., author
Prentice-Hall, 1962
Buku Teks SO
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
McKenna, George, author
McGraw-Hill, 1998
Buku Teks
Shea, John C.
St. Martin's Press, 1984
Buku Teks