MLA

Simpson, Randolph Linsly, 1927-1992. Studio unknown Full length double portrait, two ladies holding hands, one standing in dark dress, one seated with arm on table in light dress. Tintype, sixth plate. Box 7, folder 98. circa 1890. https://collections.library.yale.edu/catalog/2002155.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 7, folder 98"])(circa 1890)[Studio unknown Full length double portrait, two ladies holding hands, one standing in dark dress, one seated with arm on table in light dress. Tintype, sixth plate]. https://collections.library.yale.edu/catalog/2002155.