MLA
Louis Kaufmann & Sons (Baltimore, Md.). Uncle Peter's laugh. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/941zcrjdj1-cor.
APA, 6th edition
Louis Kaufmann & Sons (Baltimore, Md.). (unknown)[Uncle Peter's laugh]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/941zcrjdj1-cor.
Chicago
Louis Kaufmann & Sons (Baltimore, Md.), Uncle Peter's laugh, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/941zcrjdj1-cor.