MLA

Simpson, Randolph Linsly, 1927-1992. Studio unknown Cameo portrait of man within green oval; buttons on vest open. partly tinted carte de visite. Box 11, folder 332. circa 1870. https://collections.library.yale.edu/catalog/2003848.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 11, folder 332"])(circa 1870)[Studio unknown Cameo portrait of man within green oval; buttons on vest open. partly tinted carte de visite]. https://collections.library.yale.edu/catalog/2003848.