http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Số liệu thống kê việc làm và thất nghiệp ở Việt Nam giai đoạn 1996 - 2005
Bộ lao động Thương binh và Xã hội