Oxford University Press, 1995
Buku Referensi
Oxford University Press, 1995
Buku Referensi
Clarendon Press, 1996
Buku Referensi
Urwin, Kenneth
Hodder & Stoughton, 1968
Buku Referensi
edited by Marianne Chalmers and Martine Pierquin
Oxford University Press, 2002
Buku Referensi