CTA system map : February 1993. Chicago Transit Authority system map.

Chicago citation style
CTA system map : February 1993. Chicago Transit Authority system map.. 1993. Retrieved from the Digital Public Library of America, http://collections.lib.uwm.edu/cdm/ref/collection/agdm/id/22692. (Accessed December 8, 2019.)
APA citation style
(1993) CTA system map : February 1993. Chicago Transit Authority system map.. Retrieved from the Digital Public Library of America, http://collections.lib.uwm.edu/cdm/ref/collection/agdm/id/22692
MLA citation style
Retrieved from the Digital Public Library of America <http://collections.lib.uwm.edu/cdm/ref/collection/agdm/id/22692>.
Note: These citations are programmatically generated and may be incomplete.