Walker, David M.
Clarendon Press, 1980
Buku Teks
Oxford Univesity Press, 2008
Buku Referensi
edited by Margaret Drabble
Oxford University Press, 1985
Buku Referensi
Wilde, William H.
Oxford University Press, 1994
Buku Referensi
edited by Harold Osborne
Clarendon Press, 1970
Buku Referensi