MLA

Simpson, Randolph Linsly, 1927-1992. Peter McGregor, Photographer, Wappinger's Falls, NY Seated portrait of lady in polka-dot dress. Carte de visite. Box 11, folder 437. circa 1868. https://collections.library.yale.edu/catalog/2003922.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 11, folder 437"])(circa 1868)[Peter McGregor, Photographer, Wappinger's Falls, NY Seated portrait of lady in polka-dot dress. Carte de visite]. https://collections.library.yale.edu/catalog/2003922.