MLA

Brodsky, Joseph, 1940-1996. "A potom nachalsia snegopad," draft. Box 55, folder 987. undated. https://collections.library.yale.edu/catalog/17306007.

APA, 6th edition

Brodsky, Joseph, 1940-1996. (["Box 55, folder 987"])(undated)["A potom nachalsia snegopad," draft]. https://collections.library.yale.edu/catalog/17306007.