United States. Bureau of the Census. 1977 census of the construction industries: Industry series, highway and street construction contractors, SIC code 1611.
Chicago Style (17th ed.) CitationUnited States. Bureau of the Census. 1977 Census of the Construction Industries: Industry Series, Highway and Street Construction Contractors, SIC Code 1611.
MLA (9th ed.) CitationUnited States. Bureau of the Census. 1977 Census of the Construction Industries: Industry Series, Highway and Street Construction Contractors, SIC Code 1611.
Warning: These citations may not always be 100% accurate.