MLA
George Gershwin's Porgy and Bess at the Majestic Theatre. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 74. https://digital.library.emory.edu/purl/617qnk98w4-cor.
APA, 6th edition
George Gershwin's Porgy and Bess at the Majestic Theatre (Box 74). [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/617qnk98w4-cor.
Chicago
“George Gershwin's Porgy and Bess at the Majestic Theatre.” Postcards. Robert Langmuir African American Photograph Collection, n.d. Box 74. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/617qnk98w4-cor.