revised by Ivor H. Evans
Cassell & Company, 1975
Buku Referensi
Comfort, Nicholas
Cassell Publishers, 1993
Buku Referensi
Brewer, E. Cobham
New York, Harper Brothers
Buku Referensi
Phythian, B. A.
Hodder & Stoughton, 1993
Buku Referensi
edited by Stuart Brown, Diane Collinson, Robert Wilkinson
Roudledge, 1996
Buku Referensi