MLA
My Bonnie Is over the Ocean : African American Boy on a Small Sailboat [Hand Colored]. 1912. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/313zs7h46f-cor.
APA, 6th edition
My bonnie is over the ocean : African American boy on a small sailboat [hand colored] (Box 72). (1912). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/313zs7h46f-cor.
Chicago
“My Bonnie Is over the Ocean : African American Boy on a Small Sailboat [Hand Colored].” Photographic postcards. Robert Langmuir African American Photograph Collection, 1912. Box 72. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/313zs7h46f-cor.