Use Catalyst to search for books providing background information in general, relevant to your item, processes, or on trade in general.  Some subject suggestions:

Commerce
Corporations, foreign -- [country]
Economic geography
Export controls
Export sales contracts -- [country]
Free trade
Import quotas
International business enterprises
International economic relations
International trade
Manufactures -- Developing countries
Non-tarriff trade barriers -- [country]
Protectionism
Tarriff
Tarriff -- Bibliography