MLA
Chase-Riboud, Barbara, and Marc Riboud. Easter Card from Barbara Chase-Riboud and Marc Riboud to Vivian May Chase. 1962. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 1, Folder 10. https://digital.library.emory.edu/purl/4644qrfk3d-cor.
APA, 6th edition
Chase-Riboud, B., & Riboud, M. (1962). Easter card from Barbara Chase-Riboud and Marc Riboud to Vivian May Chase (Box 1, Folder 10) [Greeting cards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/4644qrfk3d-cor.
Chicago
Chase-Riboud, Barbara, and Marc Riboud. “Easter Card from Barbara Chase-Riboud and Marc Riboud to Vivian May Chase.” Greeting cards. Barbara Chase-Riboud Papers, 1962. Box 1, Folder 10. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/4644qrfk3d-cor.