Protestors waiting for Nixon

Chicago citation style
Biwer, Paul. Protestors waiting for Nixon. 1968. Retrieved from the Digital Public Library of America, http://content.mpl.org/cdm/ref/collection/HstoricPho/id/6213. (Accessed December 8, 2019.)
APA citation style
Biwer, Paul, (1968) Protestors waiting for Nixon. Retrieved from the Digital Public Library of America, http://content.mpl.org/cdm/ref/collection/HstoricPho/id/6213
MLA citation style
Biwer, Paul. Retrieved from the Digital Public Library of America <http://content.mpl.org/cdm/ref/collection/HstoricPho/id/6213>.
Note: These citations are programmatically generated and may be incomplete.