Aitchison, Jean, 1938-
Cambridge University Press, 2013
Buku Teks
Aitchison, Jean, 1938-
Cambridge University Press, 2001
Buku Teks
Jones, Mari C.
Routledge , 2006
Buku Teks
Cambridge University Press, 2004
eBooks
Hawkins, John A.
Basil Black Well , 1988
Buku Teks