MLA

Pound, Ezra, 1885-1972. Manuscript notes and drafts. Box 70, folder 3142. [1923?]. https://collections.library.yale.edu/catalog/16036224.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 70, folder 3142"])([1923?])[Manuscript notes and drafts]. https://collections.library.yale.edu/catalog/16036224.