MLA
Hahn, Albert. Good Fishing, Catskill Mountains, N.Y. : an African American Man Fishing. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 70. https://digital.library.emory.edu/purl/989r2280kq-cor.
APA, 6th edition
Hahn, A. Good fishing, Catskill Mountains, N.Y. : an African American man fishing (Box 70) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/989r2280kq-cor.
Chicago
Hahn, Albert. “Good Fishing, Catskill Mountains, N.Y. : an African American Man Fishing.” Postcards. Robert Langmuir African American Photograph Collection, n.d. Box 70. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/989r2280kq-cor.