MLA
Greetings from Savannah, Ga. : Four African American Children Sitting Outside a Log Cabin, with Two of Them Eating Something out of a Pot. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 71. https://digital.library.emory.edu/purl/8601zcrjgh-cor.
APA, 6th edition
Greetings from Savannah, Ga. : four African American children sitting outside a log cabin, with two of them eating something out of a pot (Box 71). [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8601zcrjgh-cor.
Chicago
“Greetings from Savannah, Ga. : Four African American Children Sitting Outside a Log Cabin, with Two of Them Eating Something out of a Pot.” Postcards. Robert Langmuir African American Photograph Collection, n.d. Box 71. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8601zcrjgh-cor.