MLA

H. D. (Hilda Doolittle), 1886-1961. Herring, Robert. Box 10, folder 353-64. 1928-48. https://collections.library.yale.edu/catalog/17064194.

APA, 6th edition

H. D. (Hilda Doolittle), 1886-1961. (["Box 10, folder 353-64"])(1928-48)[Herring, Robert]. https://collections.library.yale.edu/catalog/17064194.