McGuigan, J.R., Moyer, R.C., and Harris, F.H., (1999), Managerial Economics, Applications, Strategy and Tactics, 8th ed. South-Western College Publishing, Ohio.

Maurice, S.C., and Thomas, C.R., (2002), Managerial Economics, 7th ed. McGraw-Hill Irwin, New York.

Salvatore, D., (2004), Managerial Economics in a Global Economy, 5th ed., Thomson South-Western, Ohio.