U.S. Department of Labor Bureau of Labor Statistics, Occupational Outlook Handbook. 'Cement Masons, Concrete Finishers, Segmental Pavers, and Terrazzo Workers', http://stats.bls.gov/oco/ocos204.htmArchived 2006-09-24 at the Wayback Machine
web.archive.org
U.S. Department of Labor Bureau of Labor Statistics, Occupational Outlook Handbook. 'Cement Masons, Concrete Finishers, Segmental Pavers, and Terrazzo Workers', http://stats.bls.gov/oco/ocos204.htmArchived 2006-09-24 at the Wayback Machine