Curtin, Richard T.
John Wiley & Sons, 1982
Buku Teks
Urquhart-Brown, Susan, author
American Management Association, 2008
eBooks
Greene, Gardiner G., author
McGraw-Hill, 1975
Buku Teks
Albert, Kenneth J., author
McGraw-Hill, 1981
Buku Teks
Hodgetts, Richard M., author
Harcourt College Publishers, 2001
Buku Teks