MLA

Pound, Ezra, 1885-1972. Other notebooks (various topics). Box 34, folder 804-11. 1925-66, n.d.. https://collections.library.yale.edu/catalog/17180227.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 34, folder 804-11"])(1925-66, n.d.)[Other notebooks (various topics)]. https://collections.library.yale.edu/catalog/17180227.