http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Các quy định về định mức dự toán trong xây dựng cơ bản
Quốc Cường, Thanh Thảo sưu tầm và hệ thống hóa
Construction industry,Industrial procurement