Photographs and postcards
MLA
Richards, David Alan, 1945-. Photographs and postcards. Box 10. undated. https://collections.library.yale.edu/catalog/2022961.
APA, 6th edition
Richards, David Alan, 1945-. (["Box 10"])(undated)[Photographs and postcards]. https://collections.library.yale.edu/catalog/2022961.