http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Giáo trình phương pháp dạy học Tự nhiên - Xã hội (Phần A)
Dương Huy Cẩn (chủ biên); Đỗ Thị Như Uyên;...[và những người khác]