Ball, D. A., & McCulloch, W. H. (1996). International business: The challenge of global competition (6th.ed.). McGraw hill.

Ball, Donald A., and Wendell H. McCulloch. International Business: The Challenge of Global Competition. 6th.ed. Boston: McGraw hill, 1996.

Ball, Donald A., and Wendell H. McCulloch. International Business: The Challenge of Global Competition. 6th.ed. McGraw hill, 1996.