MLA

Simpson, Randolph Linsly, 1927-1992. John C. Taylor, Hartford, CT Stamped recto, "The War for the Union, Photographic History." Mounted recto, "Pontoon boats and wagons," Stereograph, orange card. Box 12, folder 556. 1890. https://collections.library.yale.edu/catalog/2005533.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 12, folder 556"])(1890)[John C. Taylor, Hartford, CT Stamped recto, "The War for the Union, Photographic History." Mounted recto, "Pontoon boats and wagons," Stereograph, orange card]. https://collections.library.yale.edu/catalog/2005533.