MLA

Whitman, Walt, 1819-1892. November Boughs, galley sheet, inscribed. Box 10, folder 218. n.d.. https://collections.library.yale.edu/catalog/2053847.

APA, 6th edition

Whitman, Walt, 1819-1892. (["Box 10, folder 218"])(n.d.)[November Boughs, galley sheet, inscribed]. https://collections.library.yale.edu/catalog/2053847.