Liu, Junhui, author
Intercontinental Press, 2010
Buku Teks
edited by Timothy D.J. Chappell
Edinburgh University, 1997
Buku Teks
Jones, Ken
Routledge, 1995
Buku Teks
Kemp, David D., author
Routledge, 1998
Buku Referensi
Watt, Kenneth E.F., 1929-
Allyn and Bacon, 1982
Buku Teks