MLA

Bennett, Gwendolyn, 1902-1981. ---, Flora. Box 1, folder 12. 1947 October 6. https://collections.library.yale.edu/catalog/16817911.

APA, 6th edition

Bennett, Gwendolyn, 1902-1981. (["Box 1, folder 12"])(1947 October 6)[---, Flora]. https://collections.library.yale.edu/catalog/16817911.