MLA

Pound, Ezra, 1885-1972. Note on Canzoni: typescript. Box 68, folder 2984. n.d.. https://collections.library.yale.edu/catalog/17430547.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 68, folder 2984"])(n.d.)[Note on Canzoni: typescript]. https://collections.library.yale.edu/catalog/17430547.