http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Một số vấn đề pháp lí và kinh tế liên doanh đầu tư du lịch
Viện Nghiên cứu phát triển du lịch
macroeconomics,vietnam - economic policy - 1986 -