Urwin, Kenneth
Hodder & Stoughton, 1968
Buku Referensi
Berlin Hodder and Stoughton 1966
Buku Referensi
Urwin, Kenneth, author
Langensheidt, 1988
Buku Referensi
Langenscheidt, 1993,
Buku Referensi
Mansion, J.E., author
London Harrap 1972-1980
Buku Referensi