MLA

Lindbergh, Anne Morrow, 1906-2001. Earhart, Amelia. Box 7, folder 124. 1932. https://collections.library.yale.edu/catalog/10016110.

APA, 6th edition

Lindbergh, Anne Morrow, 1906-2001. (["Box 7, folder 124"])(1932)[Earhart, Amelia]. https://collections.library.yale.edu/catalog/10016110.