MLA

Pound, Ezra, 1885-1972. Shaw. Box 88, folder 3787. n.d.. https://collections.library.yale.edu/catalog/17122711.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 88, folder 3787"])(n.d.)[Shaw]. https://collections.library.yale.edu/catalog/17122711.