West, Anthony R., author
John Wiley & Sons, 2014
Buku Teks
edited by A.K. Cheetham and Peter Day
Clarendon Press, 1992
Buku Teks
edited by Peter G. Bruce
Cambridge University Press, 1997
Buku Teks
Ladd, M.F.C., author
Ellis Horwood, 1979
Buku Teks
Elliott, Roger J., author
English Language Book Society, 1978
Buku Teks