NSC groups, Southern California, 1931 [envelope back]

Chicago citation style
NSC groups, Southern California, 1931 [envelope back]. Retrieved from the Digital Public Library of America, http://digitallibrary.usc.edu/cdm/ref/collection/p15799coll170/id/3431. (Accessed November 13, 2018.)
APA citation style
NSC groups, Southern California, 1931 [envelope back]. Retrieved from the Digital Public Library of America, http://digitallibrary.usc.edu/cdm/ref/collection/p15799coll170/id/3431
MLA citation style
Retrieved from the Digital Public Library of America <http://digitallibrary.usc.edu/cdm/ref/collection/p15799coll170/id/3431>.
Note: These citations are programmatically generated and may be incomplete.