Vernon, R., & Wells, L. T. (1981). Economic environment of international business (3rd ed.). Prentice-Hall.
Chicago Style (17. basım) AtıfVernon, Raymond, ve Louis T. Wells. Economic Environment of International Business. 3rd ed. Englewood Cliffs, N.J: Prentice-Hall, 1981.
MLA (9th ed.) AtıfVernon, Raymond, ve Louis T. Wells. Economic Environment of International Business. 3rd ed. Prentice-Hall, 1981.
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