MLA

H. D. (Hilda Doolittle), 1886-1961. White, Eric Walter. Box 16, folder 556-57. 1934-61. https://collections.library.yale.edu/catalog/32476531.

APA, 6th edition

H. D. (Hilda Doolittle), 1886-1961. (["Box 16, folder 556-57"])(1934-61)[White, Eric Walter]. https://collections.library.yale.edu/catalog/32476531.