Rothwell, William J., 1951-
American Management Association, 2011
eBooks
Speight, Charlotte F.
McGraw-Hill, 2004
Buku Teks
Kotler, Philip
John Wiley & Sons, 2005
Buku Teks
S.l. Alexander Hamilton Institute 19-,
Buku Teks
Moffitt, Sean
McGraw-Hill , 2011
Buku Teks