MLA

Pound, Ezra, 1885-1972. Autograph ms. and typescript. Box 139, folder 6117. n.d.. https://collections.library.yale.edu/catalog/17122865.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 139, folder 6117"])(n.d.)[Autograph ms. and typescript]. https://collections.library.yale.edu/catalog/17122865.