MLA

Brodsky, Joseph, 1940-1996. Series V -- Personal Papers -- Drawings by Brodsky -- Brodsky and Derek Walcott. Box 203, folder 4337. 1988 October 4. https://collections.library.yale.edu/catalog/2017742.

APA, 6th edition

Brodsky, Joseph, 1940-1996. (["Box 203, folder 4337"])(1988 October 4)[Series V -- Personal Papers -- Drawings by Brodsky -- Brodsky and Derek Walcott]. https://collections.library.yale.edu/catalog/2017742.