MLA

Pound, Ezra, 1885-1972. Chinese Poetry: Okakura, Sogioku and others: notebook, 1 vol.. Box 100, folder 4232. n.d.. https://collections.library.yale.edu/catalog/17122748.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 100, folder 4232"])(n.d.)[Chinese Poetry: Okakura, Sogioku and others: notebook, 1 vol.]. https://collections.library.yale.edu/catalog/17122748.