United States. Bureau of the Census. (1979). 1977 census of construction industries: Industry series, plumbing, heating (except electric), and air conditioning special trade contractors, SIC 1711.
Chicago Style (17th ed.) CitationUnited States. Bureau of the Census. 1977 Census of Construction Industries: Industry Series, Plumbing, Heating (except Electric), and Air Conditioning Special Trade Contractors, SIC 1711. 1979.
MLA (9th ed.) CitationUnited States. Bureau of the Census. 1977 Census of Construction Industries: Industry Series, Plumbing, Heating (except Electric), and Air Conditioning Special Trade Contractors, SIC 1711. 1979.
Warning: These citations may not always be 100% accurate.