MLA

Pound, Ezra, 1885-1972. No. 68, "America was Promises": typescript. Box 128, folder 5322. [1941]. https://collections.library.yale.edu/catalog/17122855.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 128, folder 5322"])([1941])[No. 68, "America was Promises": typescript]. https://collections.library.yale.edu/catalog/17122855.