edited by Edward C. Bursk and John F. Chapman
New American Library, 1964
Buku Teks
Cundiff, Edward W.
Prentice-Hall of India, 1980
Buku Teks
by Roger A. Kerin ... [and others]
McGraw-Hill, 2002
Buku Teks
Etzel, Michael J.
McGraw-Hill, 2004
Buku Teks
Kurtz, David L.
The Dryden Press , 1981
Buku Teks