Não informado. Statistics of Foreign Trade. Organization for Economic Co-operation and Development.
Chicago-referens (17:e uppl.)Não informado. Statistics of Foreign Trade. Paris: Organization for Economic Co-operation and Development.
MLA-referens (8:e uppl.)Não informado. Statistics of Foreign Trade. Organization for Economic Co-operation and Development.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.