Chase, Richard B.
McGraw-Hill, 2001
Buku Teks
Narayanan, V. K.
Prentice Hall 2001, 2001
Buku Teks
Porter, Michael E.
Free Press, 1985
Buku Teks
ed. by Nick Boulter, Murray Dalziel and Jackie Hill ; foreword by David McClelland
Crest Publishing House, 1999
Buku Referensi
Porter, Michael E.
The Free Press , 1990
Buku Teks