MLA
Monahan, H. N. African American Children Sitting While Eating Sugarcanes. 1905. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/112m63xsn4-cor.
APA, 6th edition
Monahan, H. N. (1905). African American children sitting while eating sugarcanes (Box 68) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/112m63xsn4-cor.
Chicago
Monahan, H. N. “African American Children Sitting While Eating Sugarcanes.” Photographic postcards. Robert Langmuir African American Photograph Collection, 1905. Box 68. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/112m63xsn4-cor.