1940 Census Enumeration District Descriptions - Pennsylvania - Perry County - ED 50-12, ED 50-13, ED 50-14, ED 50-15, ED 50-16, ED 50-17, ED 50-18, ED 50-19, ED 50-20, ED 50-21, ED 50-22

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 - Pennsylvania - Perry County - ED 50-12, ED 50-13, ED 50-14, ED 50-15, ED 50-16, ED 50-17, ED 50-18, ED 50-19, ED 50-20, ED 50-21, ED 50-22. 1850-01-01/1950-12-31. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/5858715. (Accessed July 23, 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 - Pennsylvania - Perry County - ED 50-12, ED 50-13, ED 50-14, ED 50-15, ED 50-16, ED 50-17, ED 50-18, ED 50-19, ED 50-20, ED 50-21, ED 50-22. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/5858715
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/5858715>.
Note: These citations are programmatically generated and may be incomplete.