MLA

Whitman, Walt, 1819-1892. "Going Somewhere," galley proof, inscribed. Box 1, folder 46. n.d.. https://collections.library.yale.edu/catalog/2053680.

APA, 6th edition

Whitman, Walt, 1819-1892. (["Box 1, folder 46"])(n.d.)["Going Somewhere," galley proof, inscribed]. https://collections.library.yale.edu/catalog/2053680.