Harris, Phil, author
Weidenfeld and Nicolson, 1993
Buku Teks
Jennings, Ivor, Sir, 1903-1965, author
Hodder and Stoughton, 1979
Buku Teks
Hill, Christopher, author
LLP, 2003
Buku Teks
Oxford University Press, 2009
Buku Referensi
Cremona, Marise, author
Macmillan, 1989
Buku Teks