MLA

Williams, William Carlos, 1883-1963. On Charles Sheeler. Box 72, folder 1534. 1958-1965. https://collections.library.yale.edu/catalog/2044323.

APA, 6th edition

Williams, William Carlos, 1883-1963. (["Box 72, folder 1534"])(1958-1965)[On Charles Sheeler]. https://collections.library.yale.edu/catalog/2044323.