MLA

Byron, Robert, 1905-1941. Draft, typescript, corrected. Box 32, folder 513-515. undated. https://collections.library.yale.edu/catalog/2107237.

APA, 6th edition

Byron, Robert, 1905-1941. (["Box 32, folder 513-515"])(undated)[Draft, typescript, corrected]. https://collections.library.yale.edu/catalog/2107237.