Map showing standard metropolitan areas

Chicago citation style
Map showing standard metropolitan areas. 1950. Retrieved from the Digital Public Library of America, http://name.umdl.umich.edu/IC-UMMU2IC-X-LS004748%5DLS004748. (Accessed December 12, 2018.)
APA citation style
(1950) Map showing standard metropolitan areas. Retrieved from the Digital Public Library of America, http://name.umdl.umich.edu/IC-UMMU2IC-X-LS004748%5DLS004748
MLA citation style
Retrieved from the Digital Public Library of America <http://name.umdl.umich.edu/IC-UMMU2IC-X-LS004748%5DLS004748>.
Note: These citations are programmatically generated and may be incomplete.