MLA

Miłosz, Czesław, 1911-2004. Clippings and empty envelopes. Box 3, folder 90. 1945-1950. https://collections.library.yale.edu/catalog/10080278.

APA, 6th edition

Miłosz, Czesław, 1911-2004. (["Box 3, folder 90"])(1945-1950)[Clippings and empty envelopes]. https://collections.library.yale.edu/catalog/10080278.