Smither, James G.
Academy of Sri Lankan Culture, 1992
Buku Referensi
Scott, James G.
Van Nostrand Reinhold, 1997
Buku Teks
Trautz, F.M.
Munchen Muller 1926
Buku Teks
Arasartnam, Sinnappah, author
Prentice-Hall, 1964
Buku Teks
Bailey, Sydney D., author
William Brendon ans Son, 1952
Buku Teks