MLA

Lindbergh, Charles A. (Charles Augustus), 1902-1974. Lindbergh, Reeve Morrow. Box 73, folder 4-5. 1948-1951. https://collections.library.yale.edu/catalog/10011563.

APA, 6th edition

Lindbergh, Charles A. (Charles Augustus), 1902-1974. (["Box 73, folder 4-5"])(1948-1951)[Lindbergh, Reeve Morrow]. https://collections.library.yale.edu/catalog/10011563.