MLA

Simpson, Randolph Linsly, 1927-1992. [Signal Corps Photo?] World War I black troopers, 35th Division, seated at desks in barracks classroom in France. Instructor at board 20th century photograph, 6-1/4 x 8-1/2. Box 22, folder 955. circa 1917. https://collections.library.yale.edu/catalog/16172752.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 22, folder 955"])(circa 1917)[[Signal Corps Photo?] World War I black troopers, 35th Division, seated at desks in barracks classroom in France. Instructor at board 20th century photograph, 6-1/4 x 8-1/2]. https://collections.library.yale.edu/catalog/16172752.