Dahm, Bernhard
Cornell University Press, 1969
Buku Teks SO
Comber, Leon
Institute of South East Asia Studies, 2015
eBooks
Bhardwaj, K.K.
ABC Publishing House, 1989
Buku Teks SO
J.J. Raj
MPH Group, 2007
Buku Teks SO
Yefimor, D
Sterling Publisher Prt Ltd, 1975
Buku Teks SO