MLA

Simpson, Randolph Linsly, 1927-1992. Unknown photographer Small boy and girl stand with flower baskets. Photographic postcard. Box 26. circa 1912. https://collections.library.yale.edu/catalog/2057838.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 26"])(circa 1912)[Unknown photographer Small boy and girl stand with flower baskets. Photographic postcard]. https://collections.library.yale.edu/catalog/2057838.