Empty envelopes
MLA
Whitman, Walt, 1819-1892. Empty envelopes. Box 10, folder 213. 1886 Nov 23. https://collections.library.yale.edu/catalog/2053842.
APA, 6th edition
Whitman, Walt, 1819-1892. (["Box 10, folder 213"])(1886 Nov 23)[Empty envelopes]. https://collections.library.yale.edu/catalog/2053842.