Simpson, Robert J.
Butterworth, 1982
Buku Teks
Goody, Roy W.
New York Glencoe 1992,
Buku Referensi
Gilmore, Charles M., author
McGraw-Hill, 1981
Buku Teks
Baldwin, J. N., author
Butterworth Scientific, 1982
Buku Teks
Rich, Lloyd, author
Reston Publishing, 1981
Buku Teks