MLA
Artvue Post Card Co. (New York, N.Y.). Mechanized house washing : African American man washing a house using a hose. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/569z08kpwb-cor.
APA, 6th edition
Artvue Post Card Co. (New York, N.Y.). (unknown)[Mechanized house washing : African American man washing a house using a hose]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/569z08kpwb-cor.
Chicago
Artvue Post Card Co. (New York, N.Y.), Mechanized house washing : African American man washing a house using a hose, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/569z08kpwb-cor.