MLA

Simpson, Randolph Linsly, 1927-1992. Underwood & Underwood, N.Y.C. "13962 A colored brigade building trenches at Camp Devans, Mass." Stereograph, grey card. Box 13, folder 694. circa 1918. https://collections.library.yale.edu/catalog/32582730.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 13, folder 694"])(circa 1918)[Underwood & Underwood, N.Y.C. "13962 A colored brigade building trenches at Camp Devans, Mass." Stereograph, grey card]. https://collections.library.yale.edu/catalog/32582730.