Fergusson, Rosalind, author
Bloomsbury Books, 1985
Buku Referensi
Gunton, Tony, author
Penguin Books, 1993
Buku Referensi
Graham, John, author
Penguin Books, 1983
Buku Referensi
Young, E.C., author
Penguin Books, 1988
Buku Referensi
Goodall, Brian, author
Penguin Books, 1987
Buku Referensi