MLA

Lindbergh, Charles A. (Charles Augustus), 1902-1974. General. Box 4, folder 12. 1927. https://collections.library.yale.edu/catalog/10013114.

APA, 6th edition

Lindbergh, Charles A. (Charles Augustus), 1902-1974. (["Box 4, folder 12"])(1927)[General]. https://collections.library.yale.edu/catalog/10013114.