http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Sách giới thiệu lịch sử thế giới gồm 3 phần: Thời nguyên thuỷ, thời cổ đai và thời trung đại.
Nghiêm Đình Vỳ (chủ biên)... [et al.]
Study and teaching (Secondary),Học và dạy học (trung học)