MLA

Simpson, Randolph Linsly, 1927-1992. J.M. Greene, Cleveland, [OH] Three quarter length portrait: man stands in suit and frock coat; prominent watch chain, right wrist rests on chair back. Carte de visite. Box 11, folder 512. undated. https://collections.library.yale.edu/catalog/16189323.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 11, folder 512"])(undated)[J.M. Greene, Cleveland, [OH] Three quarter length portrait: man stands in suit and frock coat; prominent watch chain, right wrist rests on chair back. Carte de visite]. https://collections.library.yale.edu/catalog/16189323.