MLA

Pound, Ezra, 1885-1972. Autograph ms. and typescript. Box 70, folder 3105. n.d.. https://collections.library.yale.edu/catalog/16032483.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 70, folder 3105"])(n.d.)[Autograph ms. and typescript]. https://collections.library.yale.edu/catalog/16032483.