http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
( Tóm tắt lý thuyết, hướng dẫn và giải mẫu bài tập và trả lời )
Nguyễn Nhật Lệ, Nguyễn Văn Vượng