(left to right): Frederick Amasa Coller (1887-1964), Claude Schaeffer Beck (1894-1971), and Cassius James Van Slyke (b. 1900)

Chicago citation style
(left to right): Frederick Amasa Coller (1887-1964), Claude Schaeffer Beck (1894-1971), and Cassius James Van Slyke (b. 1900). January 21, 1950. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Asiris_arc_296750&repo=DPLA. (Accessed November 16, 2018.)
APA citation style
(January 21, 1950) (left to right): Frederick Amasa Coller (1887-1964), Claude Schaeffer Beck (1894-1971), and Cassius James Van Slyke (b. 1900). Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Asiris_arc_296750&repo=DPLA
MLA citation style
Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3Asiris_arc_296750&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.