Encyclopedia of professional management
edited by Muriel Albers Bittel, Lester Robert Bittel and Jackson Eugene Ramsey
Grolier International, 1995
 Buku Referensi
Smith, Paul
Encyclopedia of Strategic Management
Crest Publishing House, 2002
 Buku Teks
Amstrong, Michael
Encyclopedia of Strategic Management
Crest Publishing House, 2002
 Buku Teks
Wooton, Simon
Encyclopedia of Strategic Management
Crest Publishing, 2002
 Buku Teks
Hancaster, Geoff
Encyclopedia of Strategic Management
Crest Publishing House, 2002
 Buku Teks