MLA

Miłosz, Czesław, 1911-2004. General ephemera. Box 223, folder 3390-3406. 1933-1985. https://collections.library.yale.edu/catalog/10034680.

APA, 6th edition

Miłosz, Czesław, 1911-2004. (["Box 223, folder 3390-3406"])(1933-1985)[General ephemera]. https://collections.library.yale.edu/catalog/10034680.