MLA

Pound, Ezra, 1885-1972. Bynner, Witter. Box 7, folder 311. 1934-63. https://collections.library.yale.edu/catalog/2026520.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 7, folder 311"])(1934-63)[Bynner, Witter]. https://collections.library.yale.edu/catalog/2026520.