Buku Referensi
compiled and arranged on an English alphabetical basis by W. E. Clason
Elsevier, 1978
Buku Referensi
Christian, J.W., author
Pergamon Press, 1975
Buku Teks
Hosford, William F., author
Prentice-Hall, 1983
Buku Teks
Stevenson, Edward J., author
Noyes Data Corporation, 1977
Buku Teks