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WikiPedia: Ước_tính_chi_phí http://www.bls.gov/ooh/business-and-financial/cost... http://energy.gov/sites/prod/files/GAO%2012-Step%2... http://www.construction-guide.in/general/construct... http://www.asce.org/ http://www.csinet.org/uniformat //doi.org/10.1080%2F1941658X.2014.984880 http://www.iceaaonline.org/ http://www.acoste.org.uk http://www.acoste.org.uk/template_home.php?page_id... https://web.archive.org/web/20091125001247/http://...