MLA

Ford, Julia Ellsworth, 1859-1950. Walt Whitman, typescript. Box 5, folder 104. undated. https://collections.library.yale.edu/catalog/17167853.

APA, 6th edition

Ford, Julia Ellsworth, 1859-1950. (["Box 5, folder 104"])(undated)[Walt Whitman, typescript]. https://collections.library.yale.edu/catalog/17167853.