MLA

Pound, Ezra, 1885-1972. Letters. Box 59, folder 2654. 1907. https://collections.library.yale.edu/catalog/2054673.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 59, folder 2654"])(1907)[Letters]. https://collections.library.yale.edu/catalog/2054673.