MLA

Simpson, Randolph Linsly, 1927-1992. Unknown photographer Full length portrait, young lady seated with bouquet of flowers. Cased tintype, sixth plate. Box 6, folder 79. circa 1875. https://collections.library.yale.edu/catalog/2002136.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 6, folder 79"])(circa 1875)[Unknown photographer Full length portrait, young lady seated with bouquet of flowers. Cased tintype, sixth plate]. https://collections.library.yale.edu/catalog/2002136.