MLA

MacLeish, Archibald, 1892-1982. Holograph manuscript, corrected. Box 1, folder 13. n.d.. https://collections.library.yale.edu/catalog/2068668.

APA, 6th edition

MacLeish, Archibald, 1892-1982. (["Box 1, folder 13"])(n.d.)[Holograph manuscript, corrected]. https://collections.library.yale.edu/catalog/2068668.