MLA

H. D. (Hilda Doolittle), 1886-1961. "Eidolon," notebook. Box 31, folder 830. n.d.. https://collections.library.yale.edu/catalog/17064213.

APA, 6th edition

H. D. (Hilda Doolittle), 1886-1961. (["Box 31, folder 830"])(n.d.)["Eidolon," notebook]. https://collections.library.yale.edu/catalog/17064213.