Heagney, Joseph, author
AMACOM, 2012
Buku Teks
Gary, Clifford F.
McGraw-Hill, 2000
Multimedia
Lewis, James P.
American Management Association, 2007
eBooks
Taylor, James, author
American Management Association, 2006
eBooks
Meredith, Jack R., author
Wiley, 2015
Buku Teks