MLA

Pound, Ezra, 1885-1972. Sarfatti, Margherita Grassini. Box 46, folder 2031. 1934-36. https://collections.library.yale.edu/catalog/32160276.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 46, folder 2031"])(1934-36)[Sarfatti, Margherita Grassini]. https://collections.library.yale.edu/catalog/32160276.