http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Những vấn đề lịch sử xã hội nguyên thủy
Viện Hàn lâm Khoa học Liên-xô; Dịch giả: Đặng Công Lý