MLA

Simpson, Randolph Linsly, 1927-1992. Underwood & Underwood, N.Y.C. "14192 15th Regt. Colored Troops giving retreat at Camp Upton, N.Y." Stereograph, grey card. Box 13, folder 695. circa 1918. https://collections.library.yale.edu/catalog/16173229.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 13, folder 695"])(circa 1918)[Underwood & Underwood, N.Y.C. "14192 15th Regt. Colored Troops giving retreat at Camp Upton, N.Y." Stereograph, grey card]. https://collections.library.yale.edu/catalog/16173229.