MLA

Hulme, Kathryn, 1900-1981. Anderson, Margaret. Box 16, folder 383-86. 1937-72, n.d.. https://collections.library.yale.edu/catalog/17060825.

APA, 6th edition

Hulme, Kathryn, 1900-1981. (["Box 16, folder 383-86"])(1937-72, n.d.)[Anderson, Margaret]. https://collections.library.yale.edu/catalog/17060825.