Arasartnam, Sinnappah
Prentice-Hall, 1964
Buku Teks SO
Trautz, F.M.
Munchen Muller 1926
Buku Teks
Ludowyk, E.F.C.
Faber and Faber, 1962
Buku Teks SO
Amerasinghe, Anthony Ranjit Bevis
Lake House Investments, 1971
Buku Teks
Tresidder, Argus John
D. Van Nostrand, 1960
Buku Teks SO