MLA
Rotograph Co. (New York, N.Y.). A Black Quartett : four African American boys sitting on and leaning against bricks. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/139x0k6dm4-cor.
APA, 6th edition
Rotograph Co. (New York, N.Y.). (unknown)[A Black Quartett : four African American boys sitting on and leaning against bricks]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/139x0k6dm4-cor.
Chicago
Rotograph Co. (New York, N.Y.), A Black Quartett : four African American boys sitting on and leaning against bricks, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/139x0k6dm4-cor.