Chapman, Robert L.
London Pan Books 1988
Buku Referensi
Green, Jonathon
Cassell & Co, 2000
Buku Referensi
Partridge, Eric, 1894-1979
Routledge, 1984
Buku Referensi
Harrap Book Limited, 1991
Buku Referensi
Phythian, B. A.
Hodder & Stoughton, 1986
Buku Referensi