Scott, James G.
Van Nostrand Reinhold, 1997
Buku Teks
Bailey, Sydney D.
William Brendon ans Son, 1952
Buku Teks
Arasartnam, Sinnappah
Prentice-Hall, 1964
Buku Teks SO
Trautz, F.M.
Munchen Muller 1926
Buku Teks
Simmons, James G.
Prentice-Hall, 1982
Buku Teks