http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Bài tập và câu hỏi trắc nghiệm thuế
Nguyễn Kim Quyến (Ch.b.), Lê Quang Cường, Đặng Thị Bạch Vân