Samuel Pierpont Langley

Chicago citation style
Unidentified Artist. Samuel Pierpont Langley. c. 1895. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anpg_NPG.78.180&repo=DPLA. (Accessed December 16, 2018.)
APA citation style
Unidentified Artist, (c. 1895) Samuel Pierpont Langley. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anpg_NPG.78.180&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.78.180&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.