MLA

Hulme, Kathryn, 1900-1981. Davidson, Louise. Box 17, folder 425. 1960-66. https://collections.library.yale.edu/catalog/17060830.

APA, 6th edition

Hulme, Kathryn, 1900-1981. (["Box 17, folder 425"])(1960-66)[Davidson, Louise]. https://collections.library.yale.edu/catalog/17060830.