http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Nội các Triều Nguyễn Khâm Đinh Đại Nam Hội Điển Sự Lệ
Trung Tâm Khoa học Xã hội và Nhân Văn Quốc Gia. Viện Sử Học