MLA

Pound, Ezra, 1885-1972. The Spoils: typescript The Terrible Night: typescript The Chess Board Clue: typescript. Box 143, folder 6274. [1955]. https://collections.library.yale.edu/catalog/32161316.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 143, folder 6274"])([1955])[The Spoils: typescript The Terrible Night: typescript The Chess Board Clue: typescript]. https://collections.library.yale.edu/catalog/32161316.