MLA

Pound, Ezra, 1885-1972. Corke, Helen. Box 10, folder 448. 1935. https://collections.library.yale.edu/catalog/17122539.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 10, folder 448"])(1935)[Corke, Helen]. https://collections.library.yale.edu/catalog/17122539.