MLA

Pound, Ezra, 1885-1972. Terra Italica: typescript. Box 138, folder 6009. n.d.. https://collections.library.yale.edu/catalog/17430573.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 138, folder 6009"])(n.d.)[Terra Italica: typescript]. https://collections.library.yale.edu/catalog/17430573.