MLA

Pound, Ezra, 1885-1972. Bridges, Robert. Box 5, folder 244. 1915. https://collections.library.yale.edu/catalog/2036587.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 5, folder 244"])(1915)[Bridges, Robert]. https://collections.library.yale.edu/catalog/2036587.