Cohn, Theodore H., author
Longman, 2003
Buku Teks
Freeman Cooper & Company, 1984
Buku Teks
edited by John Ravenhil
Oxford University Press, 2014
Buku Teks
Ohmae, Kenichi, author
The Free Press, 1985
Buku Teks
DePamphilis, Donald, author
Academic Press, 2011
Buku Teks