At Bruno Hauptmann's trial
MLA
Lindbergh, Charles A. (Charles Augustus), 1902-1974. At Bruno Hauptmann's trial. Box 15, folder 16. 1935 January 9. https://collections.library.yale.edu/catalog/10011560.
APA, 6th edition
Lindbergh, Charles A. (Charles Augustus), 1902-1974. (["Box 15, folder 16"])(1935 January 9)[At Bruno Hauptmann's trial]. https://collections.library.yale.edu/catalog/10011560.