MLA

H. D. (Hilda Doolittle), 1886-1961. Ellis, Havelock. Box 10, folder 328. 1922-38. https://collections.library.yale.edu/catalog/32476418.

APA, 6th edition

H. D. (Hilda Doolittle), 1886-1961. (["Box 10, folder 328"])(1922-38)[Ellis, Havelock]. https://collections.library.yale.edu/catalog/32476418.