MLA

Brodsky, Joseph, 1940-1996. Book cover. Box 41, folder 806. [1977]. https://collections.library.yale.edu/catalog/2057567.

APA, 6th edition

Brodsky, Joseph, 1940-1996. (["Box 41, folder 806"])([1977])[Book cover]. https://collections.library.yale.edu/catalog/2057567.