MLA

Simpson, Randolph Linsly, 1927-1992. J.A. Palmer, Aiken, SC Mounted verso: "Characteristic Southern Scenes: Cotton Field" Photographer's identification. Stereograph, yellow card. Box 12, folder 528. circa 1865. https://collections.library.yale.edu/catalog/9999044.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 12, folder 528"])(circa 1865)[J.A. Palmer, Aiken, SC Mounted verso: "Characteristic Southern Scenes: Cotton Field" Photographer's identification. Stereograph, yellow card]. https://collections.library.yale.edu/catalog/9999044.