MLA

Pound, Ezra, 1885-1972. Miscellaneous notes. Box 35, folder 812-27. n.d.. https://collections.library.yale.edu/catalog/2019157.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 35, folder 812-27"])(n.d.)[Miscellaneous notes]. https://collections.library.yale.edu/catalog/2019157.