MLA

Norman, Dorothy, 1905-1997. Arendt, Hannah. Box 68. 1947-1952. https://collections.library.yale.edu/catalog/17436428.

APA, 6th edition

Norman, Dorothy, 1905-1997. (["Box 68"])(1947-1952)[Arendt, Hannah]. https://collections.library.yale.edu/catalog/17436428.