edited by Crickette M. Sanz, Josep Call, Christophe Boesch
Cambridge University Press, 2014
Buku Teks
O`Callaghan, J.R.
Chapman & Hall, 1996
Buku Teks
Artikel Jurnal
edited by R.S.K. Barnes
John Wiley & Sons, 1977
Buku Teks
Gadgil, Madhav
Routledge , 1995
Buku Teks