1940 Census Enumeration District Descriptions - Massachusetts - Essex County - ED 19-29, ED 19-30, ED 19-31

Chicago citation style
Department of Commerce. Bureau of the Census. Office of the Assistant Director for Operations. Geography Division. (3/13/1947 - 1968). 1940 Census Enumeration District Descriptions - Massachusetts - Essex County - ED 19-29, ED 19-30, ED 19-31. 1850-01-01/1950-12-31. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/5864330. (Accessed June 21, 2018.)
APA citation style
Department of Commerce. Bureau of the Census. Office of the Assistant Director for Operations. Geography Division. (3/13/1947 - 1968), (1850-01-01/1950-12-31) 1940 Census Enumeration District Descriptions - Massachusetts - Essex County - ED 19-29, ED 19-30, ED 19-31. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/5864330
MLA citation style
Department of Commerce. Bureau of the Census. Office of the Assistant Director for Operations. Geography Division. (3/13/1947 - 1968). Retrieved from the Digital Public Library of America <http://catalog.archives.gov/id/5864330>.
Note: These citations are programmatically generated and may be incomplete.