MLA
Eckler Studio (Hot Springs, Ark.). Portrait of an African American man in a suit with a mustache. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/7440rxwdpn-cor.
APA, 6th edition
Eckler Studio (Hot Springs, Ark.). (unknown)[Portrait of an African American man in a suit with a mustache]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/7440rxwdpn-cor.
Chicago
Eckler Studio (Hot Springs, Ark.), Portrait of an African American man in a suit with a mustache, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/7440rxwdpn-cor.