Swamy, B.G.L.
McGraw-Hill, 1980
Buku Teks
Rendle, Alfred Barton, author
Vikas, 1979
Buku Teks
Attenborough, David
BBC Worldwide Limited, 2005
Multimedia
Hickey, Michael, author
Cambridge University Press, 1981
Buku Teks
Martinus Nijhoff, 1963
Buku Referensi