MLA

Lindbergh, Charles A. (Charles Augustus), 1902-1974. Newfoundland, general. Box 12, folder 3. 1933 July 13-20. https://collections.library.yale.edu/catalog/10013264.

APA, 6th edition

Lindbergh, Charles A. (Charles Augustus), 1902-1974. (["Box 12, folder 3"])(1933 July 13-20)[Newfoundland, general]. https://collections.library.yale.edu/catalog/10013264.