MLA
A.L. Macbeth Studio (Baltimore, Md.). Portrait of Rev. Josh Washington. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/24947d7wrc-cor.
APA, 6th edition
A.L. Macbeth Studio (Baltimore, Md.). (unknown)[Portrait of Rev. Josh Washington]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/24947d7wrc-cor.
Chicago
A.L. Macbeth Studio (Baltimore, Md.), Portrait of Rev. Josh Washington, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/24947d7wrc-cor.