MLA

Lindbergh, Charles A. (Charles Augustus), 1902-1974. At Lambert Field in St. Louis, Missouri. Box 8, folder 12. 1928 February 15. https://collections.library.yale.edu/catalog/10011489.

APA, 6th edition

Lindbergh, Charles A. (Charles Augustus), 1902-1974. (["Box 8, folder 12"])(1928 February 15)[At Lambert Field in St. Louis, Missouri]. https://collections.library.yale.edu/catalog/10011489.