MLA

Brodsky, Joseph, 1940-1996. Arici, Graziano. Box 142, folder 3123. undated. https://collections.library.yale.edu/catalog/10086147.

APA, 6th edition

Brodsky, Joseph, 1940-1996. (["Box 142, folder 3123"])(undated)[Arici, Graziano]. https://collections.library.yale.edu/catalog/10086147.