Sharkansky, Ira, author
McGraw-Hill, 1975
Buku Teks
Martin, Stephen, 1961-, author
Maxwell Macmillan International, 1994
Buku Teks
Redstone, Louis G.
New York: McGraw-Hill, 1981
Buku Teks
Distributed by ERIC Clearinghouse, 1978
Buku Teks
edited by Charles F. Herman, Charles W. Kegley, James N. Rosenau
Harper Collins Academic, 1987
Buku Teks