MLA

Miłosz, Czesław, 1911-2004. "Literature in Poland," drafts, typescript and copy of typescript, corrected. Box 123, folder 1910. 1948 or 1949. https://collections.library.yale.edu/catalog/10086156.

APA, 6th edition

Miłosz, Czesław, 1911-2004. (["Box 123, folder 1910"])(1948 or 1949)["Literature in Poland," drafts, typescript and copy of typescript, corrected]. https://collections.library.yale.edu/catalog/10086156.