1. VK Bhalla,Investment Management (Security Analysis and porfolio Management), S. Chand & Company, New Delhi, pp 358–365, 1997.
2. Makridakis, Wheelwtight and McGee,Forecasting Methods and Applications, John Wiley & Sons, Singapore, pp 296–302, 1988.
3. N K Bose & P Liang,Neural Network Fundamentals with Graph, Algorihm and Applications, Tata McGraw Hill, New Delhi, pp 399–404, 2001.