Dundon, Elaine, author
American Management Association, 2002
eBooks
Blank, Steve, author
K & S Rench, Inc Publishers, 2012
Buku Teks
Bygrave, William, author
Wiley, 2008
Buku Teks
Block, Zenas, author
Harvard Business School Press, 1993
Buku Teks
Shefsky, Lloyod E.
McGraw-Hill, 1994
Buku Teks