MLA
Authentic Distributors, Inc. (Massapequa, N.Y.). The broken shackles : a freed slave with broken shackles on his arms running towards Abraham Lincoln, standing by an American flag. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/389280gb90-cor.
APA, 6th edition
Authentic Distributors, Inc. (Massapequa, N.Y.). (unknown)[The broken shackles : a freed slave with broken shackles on his arms running towards Abraham Lincoln, standing by an American flag]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/389280gb90-cor.
Chicago
Authentic Distributors, Inc. (Massapequa, N.Y.), The broken shackles : a freed slave with broken shackles on his arms running towards Abraham Lincoln, standing by an American flag, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/389280gb90-cor.