MLA

West, Rebecca, 1892-1983. Biddle, Francis. Box 6, folder 140. 1946, n.d.. https://collections.library.yale.edu/catalog/16479150.

APA, 6th edition

West, Rebecca, 1892-1983. (["Box 6, folder 140"])(1946, n.d.)[Biddle, Francis]. https://collections.library.yale.edu/catalog/16479150.