Paranavitana, Senarat
Lake House Investments, 1972
Buku Teks
Amerasinghe, Anthony Ranjit Bevis
Lake House Investments, 1971
Buku Teks
Kearney, Robert N.
Cornell University Press, 1973
Buku Teks
Hulugalle, H.A.J.
Lake House Investments, 1969
Buku Teks
International cooperation Administration , [date of publication not identified]
Buku Teks