MLA

Williams, William Carlos, 1883-1963. Editions. Box 5, folder 189. 1947. https://collections.library.yale.edu/catalog/17049472.

APA, 6th edition

Williams, William Carlos, 1883-1963. (["Box 5, folder 189"])(1947)[Editions]. https://collections.library.yale.edu/catalog/17049472.