MLA
Riboud, David, and Alexis Riboud. Easter Card from Alexis Riboud and David Riboud for Their Mother, Barbara Chase-Riboud. 1967. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 1, Folder 10. https://digital.library.emory.edu/purl/047rn8pkvv-cor.
APA, 6th edition
Riboud, D., & Riboud, A. (1967). Easter card from Alexis Riboud and David Riboud for their mother, Barbara Chase-Riboud (Box 1, Folder 10) [Greeting cards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/047rn8pkvv-cor.
Chicago
Riboud, David, and Alexis Riboud. “Easter Card from Alexis Riboud and David Riboud for Their Mother, Barbara Chase-Riboud.” Greeting cards. Barbara Chase-Riboud Papers, 1967. Box 1, Folder 10. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/047rn8pkvv-cor.