Harper and Row , 1987
Buku Teks
National Association of Corrion Engineers, 1986
Buku Teks
edited by Greg Astfalk
Society for Industrial and Applied Mathematics, 1996
eBooks
Sweeney, Robert B., author
Prentice-Hall, 1971
Buku Teks
Thomas, A.J.
Pitman and Son , 1967
Buku Teks