MLA

Brodsky, Joseph, 1940-1996. Other sketches. Box 133 | Folder 2985. 1993, Undated. https://collections.library.yale.edu/catalog/11809274.

APA, 6th edition

Brodsky, Joseph, 1940-1996. (["Box 133 | Folder 2985"])(1993, Undated)[Other sketches]. https://collections.library.yale.edu/catalog/11809274.