MLA

Pound, Ezra, 1885-1972. Jordan, Viola. Box 26, folder 1106-1110. 1953-[59], n.d.. https://collections.library.yale.edu/catalog/17409017.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 26, folder 1106-1110"])(1953-[59], n.d.)[Jordan, Viola]. https://collections.library.yale.edu/catalog/17409017.