MLA

Pound, Ezra, 1885-1972. "Razo": typescript. Box 68, folder 2985. n.d.. https://collections.library.yale.edu/catalog/17430548.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 68, folder 2985"])(n.d.)["Razo": typescript]. https://collections.library.yale.edu/catalog/17430548.