MLA

Brodsky, Joseph, 1940-1996. Berberova, Nina. Box 2, folder 55. 1972-1987. https://collections.library.yale.edu/catalog/17305970.

APA, 6th edition

Brodsky, Joseph, 1940-1996. (["Box 2, folder 55"])(1972-1987)[Berberova, Nina]. https://collections.library.yale.edu/catalog/17305970.