MLA
Siegel, Cooper & Co. (N.Y.). Portrait of only an African American woman's head. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8128931zgw-cor.
APA, 6th edition
Siegel, Cooper & Co. (N.Y.). (unknown)[Portrait of only an African American woman's head]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8128931zgw-cor.
Chicago
Siegel, Cooper & Co. (N.Y.), Portrait of only an African American woman's head, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8128931zgw-cor.