http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Tài liệu luyện thi tiếng anh: 10 bài thi trắc nghiệm môn đọc - viết trình độ B = English course tests
Diana Fried-Booth and Dave and Jane Willis,Dịch và chú giải Nguyễn Trung Tánh