Gray, Basil
Buku Teks
Chaffers, W. M., author
Borden Publishing , 1946
Buku Referensi
Kee Ming-Yuet, Datin Seri, author
Kee Ming-Yuet Sdn Bhd, 2004
Buku Referensi
Laufer, Berthold, 1874-1934, author
E. J. Brill, 1909
Buku Teks
gulland, W.G.
Chapman & Hall, Ltd., , 1918
Buku Teks