Heck, H. J. (1969). The international business environment: A management guide. New York: American Management Association.
Παραπομπή Chicago StyleHeck, Harold J. The International Business Environment: A Management Guide. New York: American Management Association, 1969.
Παραπομπή MLAHeck, Harold J. The International Business Environment: A Management Guide. New York: American Management Association, 1969.
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