Hagve, D.C.
English Longvage Book Society and Longman Group , 1969
Buku Teks
Crosbie, Liz
McGraw-Hill , 1995
Buku Teks
Carr, Albert Z., author
New American Library, 1968
Buku Teks
Harvard Business School Press, 2004
Buku Teks
Dow Jones Asia Dialogue, 1996
Buku Teks