MLA

Simpson, Randolph Linsly, 1927-1992. Franz Huld, Publisher, NY "No. 67, North and South United:" Black child cradled in embrace of white child. Postcard. Box 25. circa 1910. https://collections.library.yale.edu/catalog/2057831.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 25"])(circa 1910)[Franz Huld, Publisher, NY "No. 67, North and South United:" Black child cradled in embrace of white child. Postcard]. https://collections.library.yale.edu/catalog/2057831.