Shank, Alan
Allyn and Bacon, 1984
Buku Teks
by William J. Keefe ... [and others]
The Dorsey Press, 1983
Buku Teks
Dolbeare, Kenneth M., author
D.C. Heath, 1985
Buku Teks
Woll, Peter, author
Little, Brown, 1982
Buku Teks
Wilson, James Q., author
D.C. Heath, 1995
Buku Teks