Bannock, G., author
Penguin Books, 1974
Buku Referensi
Bannock, G., author
Allen Lane / The Viking Press, 1979
Buku Referensi
edited by David Nelson
Penguin Books, 2003
Buku Referensi
Mautner, Thomas, author
Penguin Book, 2005
Buku Referensi
Fergusson, Rosalind, author
Bloomsbury Books, 1985
Buku Referensi