MLA

Simpson, Randolph Linsly, 1927-1992. Unknown photographer Three quarter length formal portrait, young lady in white dress seated in wicker chair. Photographic postcard. Box 26. circa 1910. https://collections.library.yale.edu/catalog/2042494.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 26"])(circa 1910)[Unknown photographer Three quarter length formal portrait, young lady in white dress seated in wicker chair. Photographic postcard]. https://collections.library.yale.edu/catalog/2042494.