MLA

Lindbergh, Charles A. (Charles Augustus), 1902-1974. On honeymoon with Anne Morrow Lindbergh. Box 8, folder 27. 1929 May 27. https://collections.library.yale.edu/catalog/10011490.

APA, 6th edition

Lindbergh, Charles A. (Charles Augustus), 1902-1974. (["Box 8, folder 27"])(1929 May 27)[On honeymoon with Anne Morrow Lindbergh]. https://collections.library.yale.edu/catalog/10011490.