MLA

H. D. (Hilda Doolittle), 1886-1961. Aldington, Richard [group II]. Box 52, folder 1309-11. 1916-42, n.d.. https://collections.library.yale.edu/catalog/16831085.

APA, 6th edition

H. D. (Hilda Doolittle), 1886-1961. (["Box 52, folder 1309-11"])(1916-42, n.d.)[Aldington, Richard [group II]]. https://collections.library.yale.edu/catalog/16831085.