MLA

Simpson, Randolph Linsly, 1927-1992. Jacobs & Co., Advertising, Clinton, SC "Colored Recruit...", copyright 1917. Postcard in color. Box 25. 1917. https://collections.library.yale.edu/catalog/16172721.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 25"])(1917)[Jacobs & Co., Advertising, Clinton, SC "Colored Recruit...", copyright 1917. Postcard in color]. https://collections.library.yale.edu/catalog/16172721.