Galley proof, corrected (2 copies)
MLA
Whitman, Walt, 1819-1892. Galley proof, corrected (2 copies). Box 3, folder 171. n.d.. https://collections.library.yale.edu/catalog/2001545.
APA, 6th edition
Whitman, Walt, 1819-1892. (["Box 3, folder 171"])(n.d.)[Galley proof, corrected (2 copies)]. https://collections.library.yale.edu/catalog/2001545.