MLA
Dallas Post Card Co. (Dallas, Tex.). Hall of Negro Life at Texas Centennial Exposition in Dallas, Texas. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/037hqbzkkv-cor.
APA, 6th edition
Dallas Post Card Co. (Dallas, Tex.). (unknown)[Hall of Negro Life at Texas Centennial Exposition in Dallas, Texas]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/037hqbzkkv-cor.
Chicago
Dallas Post Card Co. (Dallas, Tex.), Hall of Negro Life at Texas Centennial Exposition in Dallas, Texas, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/037hqbzkkv-cor.