MLA

Pound, Ezra, 1885-1972. Living Paideuma: typescript. Box 110, folder 4661. n.d.. https://collections.library.yale.edu/catalog/17122790.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 110, folder 4661"])(n.d.)[Living Paideuma: typescript]. https://collections.library.yale.edu/catalog/17122790.