MLA

Lindbergh, Anne Morrow, 1906-2001. Kennedy, Jacqueline. Box 10, folder 201. 1962. https://collections.library.yale.edu/catalog/10016095.

APA, 6th edition

Lindbergh, Anne Morrow, 1906-2001. (["Box 10, folder 201"])(1962)[Kennedy, Jacqueline]. https://collections.library.yale.edu/catalog/10016095.