http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Sử dụng bản đồ và phương tiện kỹ thuật trong dạy học địa lý
Nguyễn Trọng Phúc, Hoàng Xuân Lính
geography - study and teaching ( elementary )