MLA

H. D. (Hilda Doolittle), 1886-1961. Durand, Lionel. Box 9, folder 321. 1960. https://collections.library.yale.edu/catalog/10545540.

APA, 6th edition

H. D. (Hilda Doolittle), 1886-1961. (["Box 9, folder 321"])(1960)[Durand, Lionel]. https://collections.library.yale.edu/catalog/10545540.