MLA

Pound, Ezra, 1885-1972. The Amendment: typescript. Box 88, folder 3745. [1907]. https://collections.library.yale.edu/catalog/17122705.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 88, folder 3745"])([1907])[The Amendment: typescript]. https://collections.library.yale.edu/catalog/17122705.