edited by Stephen K. Bailey
United States Information Agency, 1973
Buku Teks
Stephen J. Wayne [et all.]
Thomson, 2005
Buku Teks
Schmidt, Steffen W., author
Wadsworth, 2009
Buku Teks
McKenna, George, author
McGraw-Hill, 1998
Buku Teks
Shea, John C.
St. Martin's Press, 1984
Buku Teks