The Singing Key: typescript
MLA
Pound, Ezra, 1885-1972. The Singing Key: typescript. Box 90, folder 3855-3861. n.d.. https://collections.library.yale.edu/catalog/17122717.
APA, 6th edition
Pound, Ezra, 1885-1972. (["Box 90, folder 3855-3861"])(n.d.)[The Singing Key: typescript]. https://collections.library.yale.edu/catalog/17122717.