Engel, James F., author
The Dryden Press , 1995
Buku Teks
Wells, William D., author
John Wiley & Sons, 1996
Buku Teks
Schiffman, Leon G., author
Pearson Education International, 2004
Buku Teks
Engel, James F., author
Chicago Dryden Press, 1990
Buku Teks
Mowen, John C., author
Macmillan, 1987
Buku Teks