MLA

Pound, Ezra, 1885-1972. "Il Ritorno": typescript "Ballata Per I Giorni": typescript. Box 145, folder 6369. [1936?]. https://collections.library.yale.edu/catalog/17122875.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 145, folder 6369"])([1936?])["Il Ritorno": typescript "Ballata Per I Giorni": typescript]. https://collections.library.yale.edu/catalog/17122875.