Empty envelopes
MLA
Whitman, Walt, 1819-1892. Empty envelopes. Box 2, folder 93. 1872-97. https://collections.library.yale.edu/catalog/2053727.
APA, 6th edition
Whitman, Walt, 1819-1892. (["Box 2, folder 93"])(1872-97)[Empty envelopes]. https://collections.library.yale.edu/catalog/2053727.