1. ADUL. RHAN , P. , and TABUCANON , M. T. , 1981 ,Decision models for industrial systems engineers and managers( Bangkok : Asian Institute of Technology ), pp. 273 – 348 .
2. DENISON, E, 1974 ,Amounting for United States Economic Growth: 1929–1969( Washington , D.C. : Brookings Institution ), 130 .