Robinson, Douglas, author
Routledge Press , 2006
Buku Teks
Levinson, Stephen C., author
Cambridge University Press, 1983
Buku Teks SO
Cutting, Joan
Routledge, 2002
Buku Teks SO
Leech, Geoffrey N., 1936-, author
Longman, 1996
Buku Teks
Grundy, Peter F., author
Edward Arnold, 1995
Buku Teks