MLA

Lindbergh, Charles A. (Charles Augustus), 1902-1974. In India. Box 16, folder 11. 1937 March. https://collections.library.yale.edu/catalog/10011308.

APA, 6th edition

Lindbergh, Charles A. (Charles Augustus), 1902-1974. (["Box 16, folder 11"])(1937 March)[In India]. https://collections.library.yale.edu/catalog/10011308.