(left to right): Ludwell Denny (1894-1970) and Gordon Fisher

Chicago citation style
Davis, Watson 1896-1967. (left to right): Ludwell Denny (1894-1970) and Gordon Fisher. 4-26-1964. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Asiris_arc_296548&repo=DPLA. (Accessed November 20, 2018.)
APA citation style
Davis, Watson 1896-1967, (4-26-1964) (left to right): Ludwell Denny (1894-1970) and Gordon Fisher. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Asiris_arc_296548&repo=DPLA
MLA citation style
Davis, Watson 1896-1967. Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3Asiris_arc_296548&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.