Comfort, Nicholas
Cassell Publishers, 1993
Buku Referensi
Cassell, 1993
Buku Referensi
Phythian, B. A.
Hodder & Stoughton, 1993
Buku Referensi
Brewer, E. Cobham
New York, Harper Brothers
Buku Referensi
Donald, Graeme
Simon & Schuster, 1994
Buku Referensi