MLA

Simpson, Randolph Linsly, 1927-1992. Keystone View Company, Meadville, PA; New York, NY; Portland, OR; London, ENG; "19118. Uncle Sam Provides for Comfort of his Soldiers. Colored Troops en Route to France Taking Train [indistinguishable] at Railway Division Point." Stereograph, grey card. Box 13, folder 634. circa 1917. https://collections.library.yale.edu/catalog/16172757.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 13, folder 634"])(circa 1917)[Keystone View Company, Meadville, PA; New York, NY; Portland, OR; London, ENG; "19118. Uncle Sam Provides for Comfort of his Soldiers. Colored Troops en Route to France Taking Train [indistinguishable] at Railway Division Point." Stereograph, grey card]. https://collections.library.yale.edu/catalog/16172757.