MLA

Brodsky, Joseph, 1940-1996. "U-u-u govorit cheloveku vozdukh," draft. Box 67, folder 1719. undated. https://collections.library.yale.edu/catalog/17306136.

APA, 6th edition

Brodsky, Joseph, 1940-1996. (["Box 67, folder 1719"])(undated)["U-u-u govorit cheloveku vozdukh," draft]. https://collections.library.yale.edu/catalog/17306136.