Golin, Al, author
[American Management Association;, ], 2004
eBooks
Ward, Aidan, author
John Wiley & Sons Ltd, 2003
Buku Teks
Covey, Stephen M.R., author
Free Press, 2012
Buku Teks
Obrien, Rita Cruise, author
John Wiley & Sons, 2001
Buku Teks
Covey, Stephen M.R., author
Free Press, 2008
Buku Teks