Sage Publications, 2001
Buku Teks
Bass, Bernard M., author
Allyn and Bacon, 1973
Buku Teks
Kolb, David A., author
Prentice-Hall, 1984
Buku Teks
Jex, Steve M., author
John Wiley & Sons, 2002
Buku Teks
Aamodt, Michael G., author
Wadsworth and Cengage Learning, 2013
Buku Teks