MLA

Brodsky, Joseph, 1940-1996. Updike, John. Box 192, folder 4209. 1972. https://collections.library.yale.edu/catalog/17306183.

APA, 6th edition

Brodsky, Joseph, 1940-1996. (["Box 192, folder 4209"])(1972)[Updike, John]. https://collections.library.yale.edu/catalog/17306183.