Providing safe drinking water in small systems : technology, operations, and economics
Lewis Publishers, 1999
 Buku Teks
Theil, Henri
Operations research and quantitative economics = Voorspellen en beslissen / an elementary introduction [by] Henri Theil, John C. G. Boot [and] Teun Kloek. Translated from the Dutch
McGraw-Hill Book Co. , 1965
 Buku Teks
Lipsey, Richard G.
Economics
Harper Collin, 1996
 Buku Teks
Adreson, W. H. Locke
Economics
Prentice Hall of India, 1986
 Buku Teks
Samuelson, Paul Anthony, 1915-2009
Economics
McGraw-Hill, 1992
 Buku Teks