Morris, Tom
Tianxia Wenhua Chubanshe, 1996
Buku Teks
Hui, Xu, author
Pt Elek Media Kompuntindo, 1997
Buku Teks
Langford, Beverly Y., author
American Management Association, 2005
eBooks
Asiapac Books, 2002
Buku Teks
Farnsworth, Terry
McGraw-Hill, 1981
Buku Teks