MLA

Brodsky, Joseph, 1940-1996. Russia. Box 143, folder 3181-3186. 1956-1972. https://collections.library.yale.edu/catalog/2008128.

APA, 6th edition

Brodsky, Joseph, 1940-1996. (["Box 143, folder 3181-3186"])(1956-1972)[Russia]. https://collections.library.yale.edu/catalog/2008128.