Augustin, Sally
John & Sons, Inc, 2009
Buku Teks
by Jeffrey Harrison, Robert E. Hoskisson, R. Duane Ireland, Michael A. Hitt
South Western Cengage Learning, 2013
Buku Teks
Chase, Richard B.
McGraw-Hill, 2001
Buku Teks
Bateman, Thomas S.
McGraw-Hill, 1999
Buku Teks
Porter, Michael E.
The Free Press , 1990
Buku Teks