MLA

Whitman, Walt, 1819-1892. ["Whitman, Walt, poet, was born..."], autobiographical statement, holograph, corrected. Box 10, folder 222. 1888. https://collections.library.yale.edu/catalog/2053851.

APA, 6th edition

Whitman, Walt, 1819-1892. (["Box 10, folder 222"])(1888)[["Whitman, Walt, poet, was born..."], autobiographical statement, holograph, corrected]. https://collections.library.yale.edu/catalog/2053851.