United States. Bureau of the Census. 1977 census of construction industries: Industry series, heavy construction contractors, N.E.C, SIC 1629.
Chicago Style (17th ed.) CitationUnited States. Bureau of the Census. 1977 Census of Construction Industries: Industry Series, Heavy Construction Contractors, N.E.C, SIC 1629.
MLA (9th ed.) CitationUnited States. Bureau of the Census. 1977 Census of Construction Industries: Industry Series, Heavy Construction Contractors, N.E.C, SIC 1629.
Warning: These citations may not always be 100% accurate.