http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Tiêu chuẩn nhà nước : Tuyển tập tiêu chuẩn nhà nước về những vấn đề cơ bản
Ủy ban khoa học kỹ thuật nhà nước