MLA

Williams, William Carlos, 1883-1963. Poetry. Box 18, folder 585. 1932-1948. https://collections.library.yale.edu/catalog/17049529.

APA, 6th edition

Williams, William Carlos, 1883-1963. (["Box 18, folder 585"])(1932-1948)[Poetry]. https://collections.library.yale.edu/catalog/17049529.