MLA
Novelty Photo Studio (Peoria, Ill.). African American girl in a dress, with a bow in her hair, sitting in a chair, with two African American boys standing next to her. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/573bzkh1bd-cor.
APA, 6th edition
Novelty Photo Studio (Peoria, Ill.). (unknown)[African American girl in a dress, with a bow in her hair, sitting in a chair, with two African American boys standing next to her]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/573bzkh1bd-cor.
Chicago
Novelty Photo Studio (Peoria, Ill.), African American girl in a dress, with a bow in her hair, sitting in a chair, with two African American boys standing next to her, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/573bzkh1bd-cor.