MLA

Brodsky, Joseph, 1940-1996. A French postcard, draft. Box 58 | Folder 1146. undated. https://collections.library.yale.edu/catalog/17306038.

APA, 6th edition

Brodsky, Joseph, 1940-1996. (["Box 58 | Folder 1146"])(undated)[A French postcard, draft]. https://collections.library.yale.edu/catalog/17306038.