Capron, H.L., author
The Benjamin / Cumming Publishing Company Inc., 1989
Buku Teks
Tower, Ralph B., author
Prentice-Hall, 1991
Buku Teks
Craine, J. Ffynlo, author
Addison-Wesley, 1985
Buku Teks
Johnson, David E., author
Prentice-Hall, 1979
Buku Teks
edited by J.N.R. Jeffers
Parthenon, 1992
Buku Teks