MLA

Simpson, Randolph Linsly, 1927-1992. Studio unknown Cameo portrait of John Brown, copy of earlier daguerreotype. Cabinet photograph. Box 9, folder 284. circa 1870. https://collections.library.yale.edu/catalog/2002341.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 9, folder 284"])(circa 1870)[Studio unknown Cameo portrait of John Brown, copy of earlier daguerreotype. Cabinet photograph]. https://collections.library.yale.edu/catalog/2002341.