MLA

Simpson, Randolph Linsly, 1927-1992. J.N. Wilson, Savannah, GA Mounted verso, "69. Plantation Scene: Happy Little Nigs." Stereograph, orange card. Box 12, folder 518. circa 1865. https://collections.library.yale.edu/catalog/2111699.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 12, folder 518"])(circa 1865)[J.N. Wilson, Savannah, GA Mounted verso, "69. Plantation Scene: Happy Little Nigs." Stereograph, orange card]. https://collections.library.yale.edu/catalog/2111699.