Phythian, B. A.
Hodder & Stoughton, 1993
Buku Referensi
Brewer, E. Cobham
New York, Harper Brothers
Buku Referensi
revised by Ivor H. Evans
Cassell & Company, 1975
Buku Referensi
Black, Henry Campbell
West Publishing, 1990
Buku Teks
Comfort, Nicholas
Cassell Publishers, 1993
Buku Referensi