Bird, Roger
Sweet & Maxwell, 1983
Buku Teks
Fowler, H. W. (Henry Watson), 1858-1933
Buku Teks
edited by Michael Allaby
Oxford University Press, 1992
Buku Teks
Statt, David A.
Routledge, 1998
Buku Referensi
edited by Angela Partington
Oxford University Press, 1993
Buku Referensi