http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
20 đề tài luyện thi nói trình độ C ( Áp dụng từ tháng 7/2004)
Hồ Văn Bình, Đặng Ngoc Dũng Tiến