Schur, Edwin M., author
Random House, 1968
Buku Teks
Weatherill, Stephen
Logman, 1997
Buku Teks
Hales, Michael G.
Prentice-Hall, 198
Buku Teks
Oughton, David, author
Black Stone Press Limited, 1997
Buku Teks
Stephenson, G.
Black Stone Press Limited, 1998
Buku Teks