Shay, Susan T., author
Kiplinger Books, 2001
Buku Teks
Jensen, Doug, author
American Management Association, 2007
eBooks
Falcone, Paul, author
American Management Association, 2009
eBooks
Jim Hasse
Amacom, 2011
Buku Teks
compiled and edited by Jim Hasse
[American Management Association;, ], 2011
eBooks