MLA

Simpson, Randolph Linsly, 1927-1992. Dempsey, New York Double portrait: white lady standing holding black baby standing on chair in front of her. Cabinet photograph. Box 9, folder 269. 1897. https://collections.library.yale.edu/catalog/2002321.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 9, folder 269"])(1897)[Dempsey, New York Double portrait: white lady standing holding black baby standing on chair in front of her. Cabinet photograph]. https://collections.library.yale.edu/catalog/2002321.