Griffiths, B. (1975). Invisible barriers to invisible trade. New York: Holmes & Meier publisher.
Trích dẫn kiểu ChicagoGriffiths, Brian. Invisible Barriers to Invisible Trade. New York: Holmes & Meier publisher, 1975.
Deismireacht MLAGriffiths, Brian. Invisible Barriers to Invisible Trade. New York: Holmes & Meier publisher, 1975.
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