Management of environtment
Wiley Eastern, 1980
Buku Teks
Roeber, Richard J.C.
The Organization in a chnaging environtment
Addison-Wesley, 1973
Buku Teks
Baron, David P
Business and its environtment
Prentince Hall, 1996
Buku Teks
Blough, Roy
International business:environtment and adaptation / Roy Blough
McGraw-Hill , 1966
Buku Teks
Dictionary
London: Tiger Books International, 1994,
Buku Referensi