MLA

Lindbergh, Anne Morrow, 1906-2001. Wilder, Thornton. Box 24, folder 472. 1949-1952. https://collections.library.yale.edu/catalog/10016132.

APA, 6th edition

Lindbergh, Anne Morrow, 1906-2001. (["Box 24, folder 472"])(1949-1952)[Wilder, Thornton]. https://collections.library.yale.edu/catalog/10016132.