Wilbur, C. Martin
Field Museum of Natural History, 1943
Buku Teks
Denis Twitchett
Cambridge University Press, 2006
Buku Teks
Grantham, A.E.
Methuen & Co, 1927
Buku Teks
Muhammad Aziz Ahmad
M. Ashraf, 1949
Buku Teks
Subramanian, K.R.
The Diocesan Press, 1932
Buku Teks