MLA
Manitou, Colo. : an African American Man in a Suit Petting a Dog, with an African American Girl next to Him, All on a Porch in Front of a House. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/262s4mw6p6-cor.
APA, 6th edition
Manitou, Colo. : an African American man in a suit petting a dog, with an African American girl next to him, all on a porch in front of a house (Box 72). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/262s4mw6p6-cor.
Chicago
“Manitou, Colo. : an African American Man in a Suit Petting a Dog, with an African American Girl next to Him, All on a Porch in Front of a House.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 72. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/262s4mw6p6-cor.