MLA

Simpson, Randolph Linsly, 1927-1992. Gentile, Photos and Studios, Lydian Art Gallery, 103 State Street, Chicago; Proprietor, Lydia J. Cadwell Bust portrait of Frederick Douglass, facing right. Cabinet photograph. Box 9, folder 286. circa 1875. https://collections.library.yale.edu/catalog/2002345.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 9, folder 286"])(circa 1875)[Gentile, Photos and Studios, Lydian Art Gallery, 103 State Street, Chicago; Proprietor, Lydia J. Cadwell Bust portrait of Frederick Douglass, facing right. Cabinet photograph]. https://collections.library.yale.edu/catalog/2002345.