MLA

Pound, Ezra, 1885-1972. Early: typescript. Box 86, folder 3711. [1907?]. https://collections.library.yale.edu/catalog/17122703.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 86, folder 3711"])([1907?])[Early: typescript]. https://collections.library.yale.edu/catalog/17122703.