MLA

Simpson, Randolph Linsly, 1927-1992. Unknown photographer Full length formal portrait of lady seated with elaborate gown, parasol in right hand and wearing large feathered hat. Photographic postcard. Box 25. circa 1905. https://collections.library.yale.edu/catalog/2042481.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 25"])(circa 1905)[Unknown photographer Full length formal portrait of lady seated with elaborate gown, parasol in right hand and wearing large feathered hat. Photographic postcard]. https://collections.library.yale.edu/catalog/2042481.