H.D.
MLA
H. D. (Hilda Doolittle), 1886-1961. H.D.. Box 54, folder 1355-69. 1930-61. https://collections.library.yale.edu/catalog/2003457.
APA, 6th edition
H. D. (Hilda Doolittle), 1886-1961. (["Box 54, folder 1355-69"])(1930-61)[H.D.]. https://collections.library.yale.edu/catalog/2003457.