MLA

Pound, Ezra, 1885-1972. "Ezra Pound His Metric and Poetry": typescript. Box 144, folder 6323. n.d.. https://collections.library.yale.edu/catalog/17122870.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 144, folder 6323"])(n.d.)["Ezra Pound His Metric and Poetry": typescript]. https://collections.library.yale.edu/catalog/17122870.