MLA

Simpson, Randolph Linsly, 1927-1992. Studio unknown Full length portrait, elegantly dressed lady standing in full interior set. Tintype, paper cased, sixth plate. Box 7, folder 128. circa 1890. https://collections.library.yale.edu/catalog/2002184.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 7, folder 128"])(circa 1890)[Studio unknown Full length portrait, elegantly dressed lady standing in full interior set. Tintype, paper cased, sixth plate]. https://collections.library.yale.edu/catalog/2002184.