MLA

Pound, Ezra, 1885-1972. [Idea of a Christian Society?]: Notes for review: typescript. Box 97, folder 4139. n.d.. https://collections.library.yale.edu/catalog/17122735.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 97, folder 4139"])(n.d.)[[Idea of a Christian Society?]: Notes for review: typescript]. https://collections.library.yale.edu/catalog/17122735.