Bannock, G.
Allen Lane / The Viking Press, 1979
Buku Referensi
edited by David Nelson
Penguin Books, 2003
Buku Referensi
Mautner, Thomas
Penguin Book, 2005
Buku Referensi
Fergusson, Rosalind
Bloomsbury Books, 1985
Buku Referensi
Gunton, Tony
Penguin Books, 1993
Buku Referensi