Crystal, David, 1941-
Cambridge University Press, 2005
Buku Teks
Cambridge University Press, 2004
eBooks
Dalby, Andrew
A. Lane, 2002
Buku Teks
Bloomfield, Leonard
Holt, Rinehart and Winston, 1961
Buku Teks
Austin, Peter K., editor
Cambridge University Press, 2011
eBooks