Hickman, Craig R., author
Tian xia wen hua chu ban gu fen you xian gong si, 1996
Buku Teks
Langford, Beverly Y., author
American Management Association, 2005
eBooks
Hagve, D.C.
English Longvage Book Society and Longman Group , 1969
Buku Teks
Shechtman, Morris R.
Prentice-Hall, 1994
Buku Teks
Asiapac Books, 2002
Buku Teks