MLA
Guionnaud, Albert. A Glimpse of the Atlantic Ocean, Palm Beach, Fla. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/252j6q575b-cor.
APA, 6th edition
Guionnaud, A. A glimpse of the Atlantic Ocean, Palm Beach, Fla. (Box 72) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/252j6q575b-cor.
Chicago
Guionnaud, Albert. “A Glimpse of the Atlantic Ocean, Palm Beach, Fla.” Postcards. Robert Langmuir African American Photograph Collection, n.d. Box 72. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/252j6q575b-cor.