MLA
Blessing & Kuhn (Baltimore, Md.). African American woman sitting and holding a little boy. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/709w0vt4fp-cor.
APA, 6th edition
Blessing & Kuhn (Baltimore, Md.). (unknown)[African American woman sitting and holding a little boy]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/709w0vt4fp-cor.
Chicago
Blessing & Kuhn (Baltimore, Md.), African American woman sitting and holding a little boy, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/709w0vt4fp-cor.