MLA

Pound, Ezra, 1885-1972. "Tarr": typescript. Box 144, folder 6327. n.d.. https://collections.library.yale.edu/catalog/17122873.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 144, folder 6327"])(n.d.)["Tarr": typescript]. https://collections.library.yale.edu/catalog/17122873.