Cite

"A Thought on Shak[e]speare," galley proof

MLA

Whitman, Walt, 1819-1892. "A Thought on Shak[e]speare," galley proof. Box 3, folder 117. n.d.. https://collections.library.yale.edu/catalog/2053751.

APA, 6th edition

Whitman, Walt, 1819-1892. (["Box 3, folder 117"])(n.d.)["A Thought on Shak[e]speare," galley proof]. https://collections.library.yale.edu/catalog/2053751.