MLA
Illustrated Post Card Co. (N.Y.). A dark outlook : five African American children looking out a window of a wood dwelling [hand colored]. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/129p2ngf3n-cor.
APA, 6th edition
Illustrated Post Card Co. (N.Y.). (unknown)[A dark outlook : five African American children looking out a window of a wood dwelling [hand colored]]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/129p2ngf3n-cor.
Chicago
Illustrated Post Card Co. (N.Y.), A dark outlook : five African American children looking out a window of a wood dwelling [hand colored], unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/129p2ngf3n-cor.