edited by Margaret Drabble
Oxford University Press, 1985
Buku Referensi
Hart, James, author
Oxford University Press, 1965
Buku Referensi
Peter Pierce, Rosemary Hunter, editor
Oxford Univeristy Press, 1987
Buku Referensi
prepared by the Cartographic Department of the Clarendon Press
Oxford University Press, 1972
Buku Referensi
Buxton, L.H. Dudley, author
The Clarendon Press, 1935
Buku Teks