http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Tuyển tập 20 năm đề thi Olympic 30 tháng 4 hóa học 10
Nội dung sách gồm các đề thi chính thức từ 1996-2013; các đề thi theo chuyên đề; các đề thi đề nghị.
Study and teaching (Secondary),Dạy và học (Trung học)