http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Nhiệm vụ cơ bản của kế hoạch nhà nước 5 năm 1976 - 1980 và nhiệm vụ cụ thể của kế hoạch nhà nước năm 1978