MLA

West, Rebecca, 1892-1983. Vaughan, Constance. Box 17, folder 857. 1922 Dec 4. https://collections.library.yale.edu/catalog/16043328.

APA, 6th edition

West, Rebecca, 1892-1983. (["Box 17, folder 857"])(1922 Dec 4)[Vaughan, Constance]. https://collections.library.yale.edu/catalog/16043328.