MLA
Mitchell, Edward H. Coconut Grove, Hawaiian Islands : Two Young African American Men and Two African American Boys Climbing Trees in Coconut Grove [Hand Colored]. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/959189322t-cor.
APA, 6th edition
Mitchell, E. H. Coconut Grove, Hawaiian Islands : two young African American men and two African American boys climbing trees in Coconut Grove [hand colored] (Box 68) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/959189322t-cor.
Chicago
Mitchell, Edward H. “Coconut Grove, Hawaiian Islands : Two Young African American Men and Two African American Boys Climbing Trees in Coconut Grove [Hand Colored].” Postcards. Robert Langmuir African American Photograph Collection, n.d. Box 68. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/959189322t-cor.