MLA

Pound, Ezra, 1885-1972. Koteliansky, Samuel Solomonovitch. Box 27, folder 1165. 1930. https://collections.library.yale.edu/catalog/17122585.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 27, folder 1165"])(1930)[Koteliansky, Samuel Solomonovitch]. https://collections.library.yale.edu/catalog/17122585.