MLA

Pound, Ezra, 1885-1972. "Bolo" poems: autograph ms.. Box 144, folder 6322. n.d.. https://collections.library.yale.edu/catalog/2000074.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 144, folder 6322"])(n.d.)["Bolo" poems: autograph ms.]. https://collections.library.yale.edu/catalog/2000074.