Pontoon A-4 under construction, Lake Washington Floating Bridge, July 26, 1939

Chicago citation style
Simmer. Pontoon A-4 under construction, Lake Washington Floating Bridge, July 26, 1939. 1939. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/transportation/id/1013. (Accessed July 19, 2018.)
APA citation style
Simmer, (1939) Pontoon A-4 under construction, Lake Washington Floating Bridge, July 26, 1939. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/transportation/id/1013
MLA citation style
Simmer. Retrieved from the Digital Public Library of America <http://cdm16786.contentdm.oclc.org/cdm/ref/collection/transportation/id/1013>.
Note: These citations are programmatically generated and may be incomplete.