MLA

Simpson, Randolph Linsly, 1927-1992. Underwood & Underwood, New York & Ottawa, Kas.; Arlington, NJ "14193-The original Buffaloes, 367th Infantry, Colored troops, Rifle Practice, Camp Upton, N.Y." Stereograph, grey card. Box 13, folder 670. circa 1917. https://collections.library.yale.edu/catalog/16172760.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 13, folder 670"])(circa 1917)[Underwood & Underwood, New York & Ottawa, Kas.; Arlington, NJ "14193-The original Buffaloes, 367th Infantry, Colored troops, Rifle Practice, Camp Upton, N.Y." Stereograph, grey card]. https://collections.library.yale.edu/catalog/16172760.