A Norman Jeffares, Martin Gray, editor
HarperCollinPublisher, 1995
Buku Referensi
Oxford University
London, Oxford University Press
Buku Referensi
edited by Angela Partington
Oxford University Press, 1993
Buku Referensi
London, Oxford University Press
Buku Referensi
Sharpe, Gareth, author
Guinness Publishing, 1994
Buku Referensi