MLA

Simpson, Randolph Linsly, 1927-1992. Black & Case, Photographic Artists, 163 & 173 Washington St., Boston & 2 Downing's Block, Newport, RI Cameo portrait of George Thompson. Carte de visite. Box 11, folder 430. undated. https://collections.library.yale.edu/catalog/2004000.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 11, folder 430"])(undated)[Black & Case, Photographic Artists, 163 & 173 Washington St., Boston & 2 Downing's Block, Newport, RI Cameo portrait of George Thompson. Carte de visite]. https://collections.library.yale.edu/catalog/2004000.