Bowerman, B. L., and R. T. O'Connell. Forecasting and Time Series: An Applied Approach, 3d ed. Duxbury, 2000. Box,G.E. P.,G. M. Jenkins, and G. C. Reinsel. Tie Series Analysis: Forecasting and Control, 3ded. Prentice Hlall, 1994. Hanke, J. E., and A. G. Rcitsch. Business Forecasting, 6th ed. Prentice Hall, 1998. Maknidakis, S. G., S. C. Wheelwright, and R. J. Hlyndman. Forecasting: Methods and Applicarions, 3d ed. Wiley, 1997. Wilson, J. H., and B. Keating. Business Forecasting, 3d ed. Irwin, 1998.