MLA

H. D. (Hilda Doolittle), 1886-1961. Bethlehem, Pennsylvania. Box 52, folder 1314. n.d.. https://collections.library.yale.edu/catalog/32478632.

APA, 6th edition

H. D. (Hilda Doolittle), 1886-1961. (["Box 52, folder 1314"])(n.d.)[Bethlehem, Pennsylvania]. https://collections.library.yale.edu/catalog/32478632.