Keen, Jeffrey S.
John Wiley & Sons, 1981
Buku Teks
Lundeberg, Mats, author
Prentice-Hall, 1981
Buku Teks
Smith, Ralph C., author
Society for Industrial and Applied Mathematics, 2005
eBooks
edited by Daniel L. Young, Seth Michelson
John Wiley & Sons, 2012
eBooks
World Bank
Oxford University Press, 1989
Buku Teks