MLA

Miłosz, Czesław, 1911-2004. Hersch, Jeanne. Box 25, folder 403-406. 1952-1997, undated. https://collections.library.yale.edu/catalog/2057795.

APA, 6th edition

Miłosz, Czesław, 1911-2004. (["Box 25, folder 403-406"])(1952-1997, undated)[Hersch, Jeanne]. https://collections.library.yale.edu/catalog/2057795.