MLA

Asakawa, Kan'ichi, 1873-1948. Roosevelt, Franklin Delano. Box 4, folder 43 | reel 4U. 1941 November 23. https://collections.library.yale.edu/catalog/32482328.

APA, 6th edition

Asakawa, Kan'ichi, 1873-1948. (["Box 4, folder 43 | reel 4U"])(1941 November 23)[Roosevelt, Franklin Delano]. https://collections.library.yale.edu/catalog/32482328.