MLA

Miłosz, Czesław, 1911-2004. Traktat moralny, typescript. Box 91, folder 1306. 1951-1952. https://collections.library.yale.edu/catalog/10034686.

APA, 6th edition

Miłosz, Czesław, 1911-2004. (["Box 91, folder 1306"])(1951-1952)[Traktat moralny, typescript]. https://collections.library.yale.edu/catalog/10034686.