MLA

Simpson, Randolph Linsly, 1927-1992. Unknown French printer "Etats-Unis. Blanc et Noir:" Theodore Roosevelt with caricatured black man. Postcard. Box 25. 1904. https://collections.library.yale.edu/catalog/2037951.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 25"])(1904)[Unknown French printer "Etats-Unis. Blanc et Noir:" Theodore Roosevelt with caricatured black man. Postcard]. https://collections.library.yale.edu/catalog/2037951.