http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Giáo trình thương mại quốc tế (Kinh tế quốc tế) : Lý thuyết và bài tập có lời giải (Lý thuyết & chính sách hội nhập kinh tế quốc tế, Số liệu kinh tế thương mại thế giới cập nhật đến năm 2010