Robert E. Lee

Chicago citation style
Unidentified Artist. Robert E. Lee. 1862. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anpg_NPG.84.90&repo=DPLA. (Accessed December 14, 2018.)
APA citation style
Unidentified Artist, (1862) Robert E. Lee. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anpg_NPG.84.90&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.84.90&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.