"Feb. 9 [18]80," holograph manuscript, signed
MLA
Whitman, Walt, 1819-1892. "Feb. 9 [18]80," holograph manuscript, signed. Box 3, folder 128. 1880 Feb 9. https://collections.library.yale.edu/catalog/2053762.
APA, 6th edition
Whitman, Walt, 1819-1892. (["Box 3, folder 128"])(1880 Feb 9)["Feb. 9 [18]80," holograph manuscript, signed]. https://collections.library.yale.edu/catalog/2053762.