MLA

Miłosz, Czesław, 1911-2004. Straszewicz, Czesław. Box 59, folder 815. 1953. https://collections.library.yale.edu/catalog/10082369.

APA, 6th edition

Miłosz, Czesław, 1911-2004. (["Box 59, folder 815"])(1953)[Straszewicz, Czesław]. https://collections.library.yale.edu/catalog/10082369.