Locke, A., author
The Malaysian Branch of the Royal Asiatic Society, 1993
Buku Teks
Awang Goneng, author
Monsoon books pte ltd, 2011
Buku Teks
Swamy, Narayan, author
Vijitha Yapa Publications, 2006
Buku Teks
Ajao, Aderogba
Swada, 1963
Buku Teks
Tocquer, Gerard A., author
Prentice-Hall, 1998
Buku Teks