Hamilton, Robert W., author
West Publishing, 1992
Buku Teks
Ludowyk, E.F.C., author
Faber and Faber, 1962
Buku Teks
Kearney, Robert N.
Cornell University Press, 1973
Buku Teks
edited by C.H. Philips
Oxford University Press, 1961
Buku Teks
Paranavitana, Senarat, author
Lake House Investments, 1972
Buku Teks