Liberty Gasoline advertisement to paste on layout of pumps, Southern California, 1931 [envelope back]

Chicago citation style
Liberty Gasoline advertisement to paste on layout of pumps, Southern California, 1931 [envelope back]. Retrieved from the Digital Public Library of America, http://digitallibrary.usc.edu/cdm/ref/collection/p15799coll170/id/3596. (Accessed November 20, 2018.)
APA citation style
Liberty Gasoline advertisement to paste on layout of pumps, Southern California, 1931 [envelope back]. Retrieved from the Digital Public Library of America, http://digitallibrary.usc.edu/cdm/ref/collection/p15799coll170/id/3596
MLA citation style
Retrieved from the Digital Public Library of America <http://digitallibrary.usc.edu/cdm/ref/collection/p15799coll170/id/3596>.
Note: These citations are programmatically generated and may be incomplete.