Morris, Thomas
G.P. Putnam?s Sons, 1994.
Buku Teks
Carrell, Michael R., author
Prentice-Hall, 1997
Buku Teks
Ivancevich, John M., author
Irwin/McGraw-Hill, 1999
Buku Teks
Northcraft, Gregory B., author
The Dryden Press , 1990
Buku Teks
George, Jennifer M., author
Prentice Hall,, 2002
Buku Teks