MLA
Hebard & Cook (Hastings, Neb.). Portrait of an African American woman. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/52908kprwd-cor.
APA, 6th edition
Hebard & Cook (Hastings, Neb.). (unknown)[Portrait of an African American woman]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/52908kprwd-cor.
Chicago
Hebard & Cook (Hastings, Neb.), Portrait of an African American woman, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/52908kprwd-cor.