MLA
A.L. Macbeth Studio (Baltimore, Md.). Family of Arthur L. Macbeth of Baltimore, Md., (originally of Charleston, S.C.). unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/815p8cz933-cor.
APA, 6th edition
A.L. Macbeth Studio (Baltimore, Md.). (unknown)[Family of Arthur L. Macbeth of Baltimore, Md., (originally of Charleston, S.C.)]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/815p8cz933-cor.
Chicago
A.L. Macbeth Studio (Baltimore, Md.), Family of Arthur L. Macbeth of Baltimore, Md., (originally of Charleston, S.C.), unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/815p8cz933-cor.