Dua, R.P., author
S. Chand, 1966
Buku Teks
Okamoto, Shumpei, author
Columbia University Press, 1970
Buku Teks
Artikel Jurnal
Connaughton, R.M., author
Routledge, 1991
Buku Teks
Printed for H.M. Stationery off., by Harrison and sons, 1910-20
Buku Teks