Collier, John G. (John Greenwood), author
Cambridge University Pers, 1994
Buku Teks
Harris, Phil, author
Weidenfeld and Nicolson, 1993
Buku Teks
Jennings, Ivor, Sir, 1903-1965, author
Hodder and Stoughton, 1979
Buku Teks
Schmitthoff, Clive M., author
Stevens & Sons, 1972
Buku Teks
Sim, R.S.
Butterworth, 1984
Buku Teks