MLA
Eastern Photo Post Card Studio (Omaha, Neb.). Two African American men behind a hot air balloon cut-out above a picture of a street. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/631cjsxkwh-cor.
APA, 6th edition
Eastern Photo Post Card Studio (Omaha, Neb.). (unknown)[Two African American men behind a hot air balloon cut-out above a picture of a street]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/631cjsxkwh-cor.
Chicago
Eastern Photo Post Card Studio (Omaha, Neb.), Two African American men behind a hot air balloon cut-out above a picture of a street, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/631cjsxkwh-cor.