MLA

Brodsky, Joseph, 1940-1996. Italy. Box 157, folder 3550-3562. 1983-1995, undated. https://collections.library.yale.edu/catalog/9998356.

APA, 6th edition

Brodsky, Joseph, 1940-1996. (["Box 157, folder 3550-3562"])(1983-1995, undated)[Italy]. https://collections.library.yale.edu/catalog/9998356.