Redwood, Stephen, author
John Wiley & Sons, 1999
Buku Teks
McCrea, Bridget, author
[American Management Association, ], 2005
eBooks
Egan, Mike, author
McGraw-Hill, 2012
Buku Teks
Arthur, Diane, author
[American Management Association, ], 2008
eBooks
Zarefsky, David, author
Allyn and Bacon, 2011
Buku Teks