Curzon, L.B.
Pitman, 1994
Buku Referensi
editor, Elizabeth A. Martin
Oxford University Press, 1994
Buku Referensi
Harris, Phil
Weidenfeld and Nicolson, 1993
Buku Teks
Jennings, Ivor, Sir, 1903-1965
Hodder and Stoughton, 1979
Buku Teks
Farrar, Harry
The Donnington Press, 1970
Buku Teks