MLA

H. D. (Hilda Doolittle), 1886-1961. Macpherson, Kenneth. Box 17, folder 601. 1936. https://collections.library.yale.edu/catalog/17064204.

APA, 6th edition

H. D. (Hilda Doolittle), 1886-1961. (["Box 17, folder 601"])(1936)[Macpherson, Kenneth]. https://collections.library.yale.edu/catalog/17064204.