Khanapetov, M.
MIR Publisher, 1977
Buku Teks
Little, Richard L., author
McGraw-Hill, 1973
Buku Teks
Gibson, Stuart W., author
Mac Millan Press , 1994
Buku Teks
Abington Publishing,
Majalah, Jurnal, Buletin
Carr, Richard H., author
Prentice-Hall, 1983
Buku Teks