http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Giáo trình cơ sở hóa học hữu cơ
Trần Quốc Sơn, Đặng Văn Liếu, Nguyễn Văn Tòng
Bộ GD & ĐT. Dự án đào tạo giáo viên THCS