Bartee, Edwin M.
Prentice-Hall, 1968
Buku Teks
Winer, B.J.
McGraw-Hill, 1971
Buku Teks
Smith, Wendell F.
Society for Industrial and Applied Mathematics, 2005
eBooks
Michael S. Lewis-Beck, editor
Sage Publications, Topan Publishing, 1993
Buku Referensi
edited by Victor Chew
John Wiley & Sons, 1958
Buku Teks SO