Rotherham, L., author
Clarendon Press, 1984
Buku Teks
Carter, C.F.
Oxford University Press , 1958
Buku Teks
edited by Geoffrey Walford
Falmer Press, 1998
Buku Teks
White, P.A.F., author
Macmillan, 1975
Buku Teks
Pratt, John, author
Pitman , 1974
Buku Teks