MLA

Lindbergh, Charles A. (Charles Augustus), 1902-1974. Morrow, Dwight Whitney, Sr.. Box 38, folder 11. Circa 1894-1937. https://collections.library.yale.edu/catalog/10014204.

APA, 6th edition

Lindbergh, Charles A. (Charles Augustus), 1902-1974. (["Box 38, folder 11"])(Circa 1894-1937)[Morrow, Dwight Whitney, Sr.]. https://collections.library.yale.edu/catalog/10014204.