MLA

Hulme, Kathryn, 1900-1981. Heap, Jane: obituary. Box 21, folder 548. n.d.. https://collections.library.yale.edu/catalog/17060834.

APA, 6th edition

Hulme, Kathryn, 1900-1981. (["Box 21, folder 548"])(n.d.)[Heap, Jane: obituary]. https://collections.library.yale.edu/catalog/17060834.