MLA

Brodsky, Joseph, 1940-1996. Italy. Box 156, folder 3543-3549. 1983-1995, undated. https://collections.library.yale.edu/catalog/15497610.

APA, 6th edition

Brodsky, Joseph, 1940-1996. (["Box 156, folder 3543-3549"])(1983-1995, undated)[Italy]. https://collections.library.yale.edu/catalog/15497610.