GRIFFIN, R. W. (2005). International business ed.4. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)GRIFFIN, Ricky W. International Business Ed.4. Prentice Hall, 2005.
Lua MLA (8ú heag.)GRIFFIN, Ricky W. International Business Ed.4. Prentice Hall, 2005.
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