MLA

Simpson, Randolph Linsly, 1927-1992. Unknown photographer, Baltimore[?] Hattie Cartwright Powell (1796-1881), Mother of Erasmus Cartwright; portrait of lady seated with white bonnet and hands folded in lap. Daguerreotype, sixth plate. Box 1, folder 3. circa 1855. https://collections.library.yale.edu/catalog/2002065.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 1, folder 3"])(circa 1855)[Unknown photographer, Baltimore[?] Hattie Cartwright Powell (1796-1881), Mother of Erasmus Cartwright; portrait of lady seated with white bonnet and hands folded in lap. Daguerreotype, sixth plate]. https://collections.library.yale.edu/catalog/2002065.