Cassius Marcellus Clay

Chicago citation style
Unidentified Artist. Cassius Marcellus Clay. 1860. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anpg_NPG.78.5&repo=DPLA. (Accessed December 15, 2018.)
APA citation style
Unidentified Artist, (1860) Cassius Marcellus Clay. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anpg_NPG.78.5&repo=DPLA
MLA citation style
Unidentified Artist. Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3Anpg_NPG.78.5&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.