Ball, D. A., McCulloch, W. H. M., Frantz, P. L., Geringer, J., Minor, M. S., & McNett, J. M. (2008). International business: The challenge of global competition (11th ed.). McGraw-Hill Irwin.

Ball, Donald A., Wendell H. McCulloch McCulloch, Paul L. Frantz, J.Michael Geringer, Michael S. Minor, and Jeanne M. McNett. International Business: The Challenge of Global Competition. 11th ed. Boston: McGraw-Hill Irwin, 2008.

Ball, Donald A., et al. International Business: The Challenge of Global Competition. 11th ed. McGraw-Hill Irwin, 2008.