MLA

Pound, Ezra, 1885-1972. The Wisdom of Poetry: typescript. Box 140, folder 6181. n.d.. https://collections.library.yale.edu/catalog/17430580.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 140, folder 6181"])(n.d.)[The Wisdom of Poetry: typescript]. https://collections.library.yale.edu/catalog/17430580.