HMSO, 1987
Buku Teks
Simpson, Barry J.
E & FN Spon, 1994
Buku Teks
Adams, John, 1938-, author
Routledge & Kegan Paul, 1981
Buku Teks
Williams, Stephen, author
Routledge , 1995
Buku Teks
edited by Victor A. Hauser
Oxford University Press, 1986
Buku Teks