Artikel Jurnal
Hollick, Ann L.
Princeton University press, 1981
Buku Teks
Holmes, Ann E.M.,
Black Stone Press Limited, 1995
Buku Teks
Kelly, David, author
Cavendish Pub. Lid, 1998
Buku Teks
Churchill, Winston, Sir, 1874-1965, author
Houghton Miffiln, 1950
Buku Teks