MLA

Simpson, Randolph Linsly, 1927-1992. Alt Co. "Old Black Joe." Old man seated wearing hat. Postcard. In negative lower left, "Copyrighted 1907 C. Eckstone." Postcard. Box 25. 1907. https://collections.library.yale.edu/catalog/2057825.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 25"])(1907)[Alt Co. "Old Black Joe." Old man seated wearing hat. Postcard. In negative lower left, "Copyrighted 1907 C. Eckstone." Postcard]. https://collections.library.yale.edu/catalog/2057825.