MLA
A Man, Holding Two Children on His Lap, a Woman Holding Two Children on Her Lap and Two Other Children Sitting next to Her. 1898. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 75. https://digital.library.emory.edu/purl/805fbg79dc-cor.
APA, 6th edition
A man, holding two children on his lap, a woman holding two children on her lap and two other children sitting next to her (Box 75). (1898). [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/805fbg79dc-cor.
Chicago
“A Man, Holding Two Children on His Lap, a Woman Holding Two Children on Her Lap and Two Other Children Sitting next to Her.” Postcards. Robert Langmuir African American Photograph Collection, 1898. Box 75. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/805fbg79dc-cor.