Ball, D. A., & McCulloch, W. H. (1996). International business: The challenge of global competition (6th.ed.). McGraw hill.
Lua i Stíl Chicago (17ú heag.)Ball, Donald A., agus Wendell H. McCulloch. International Business: The Challenge of Global Competition. 6th.ed. Boston: McGraw hill, 1996.
Lua MLA (9ú heag.)Ball, Donald A., agus Wendell H. McCulloch. International Business: The Challenge of Global Competition. 6th.ed. McGraw hill, 1996.
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