MLA

Simpson, Randolph Linsly, 1927-1992. Unknown photographer trademark Three quarter length triple portrait of thee men, the one in the center wearing a derby hat, holding open suit jacket to reveal fob in his vest pocket. Photographic postcard. Box 25. circa 1912. https://collections.library.yale.edu/catalog/2042480.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 25"])(circa 1912)[Unknown photographer trademark Three quarter length triple portrait of thee men, the one in the center wearing a derby hat, holding open suit jacket to reveal fob in his vest pocket. Photographic postcard]. https://collections.library.yale.edu/catalog/2042480.