Bhatia, Tej K., author
Routledge, 2000
Buku Teks
Coggle, Paul, author
Teach Youeself Books, 1991
Buku Teks
Bruce, R. Robert, author
Hodder & Stoughton, 1994
Buku Teks
Tong, Keith S. T., author
Routledge, 1994
Buku Teks
Sutanto Atmosumarto, author
Routledge, 1994
Buku Teks