Baker, William F., author
American Management Association;, 2008
eBooks
Tracy, Brian, author
American Management Association, 2011
eBooks
Royal, Mark, 1967- , author
[American Management Association, ], 2012
eBooks
Casullo, David, author
McGraw-Hill , 2012
Buku Teks
Blanchard, Ken, author
Elex Media Komputindo, 2007
Buku Teks