MLA

Brodsky, Joseph, 1940-1996. Venclova, Tomas. Box 155, folder 3503-3506. 1995, undated. https://collections.library.yale.edu/catalog/2057192.

APA, 6th edition

Brodsky, Joseph, 1940-1996. (["Box 155, folder 3503-3506"])(1995, undated)[Venclova, Tomas]. https://collections.library.yale.edu/catalog/2057192.