MLA

Pound, Ezra, 1885-1972. The Wheel of Ixion: typescript. Box 140, folder 6166. n.d.. https://collections.library.yale.edu/catalog/17122868.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 140, folder 6166"])(n.d.)[The Wheel of Ixion: typescript]. https://collections.library.yale.edu/catalog/17122868.