MLA

Lindbergh, Charles A. (Charles Augustus), 1902-1974. Shriver, Sargent. Box 27, folder 825. 1939. https://collections.library.yale.edu/catalog/10013897.

APA, 6th edition

Lindbergh, Charles A. (Charles Augustus), 1902-1974. (["Box 27, folder 825"])(1939)[Shriver, Sargent]. https://collections.library.yale.edu/catalog/10013897.