MLA

Miłosz, Czesław, 1911-2004. Miscellanea. Box 187, folder 2924-2930. undated. https://collections.library.yale.edu/catalog/2056354.

APA, 6th edition

Miłosz, Czesław, 1911-2004. (["Box 187, folder 2924-2930"])(undated)[Miscellanea]. https://collections.library.yale.edu/catalog/2056354.