Trautz, F.M.
Munchen Muller 1926
Buku Teks
Arasartnam, Sinnappah, author
Prentice-Hall, 1964
Buku Teks
Ludowyk, E.F.C., author
Faber and Faber, 1962
Buku Teks
Amerasinghe, Anthony Ranjit Bevis, author
Lake House Investments, 1971
Buku Teks
Kearney, Robert N.
Cornell University Press, 1973
Buku Teks