MLA

Pound, Ezra, 1885-1972. "Norman Angell": typescript. Box 128, folder 5331. [1941] Jun 19-20. https://collections.library.yale.edu/catalog/10034696.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 128, folder 5331"])([1941] Jun 19-20)["Norman Angell": typescript]. https://collections.library.yale.edu/catalog/10034696.