MLA

Whitman, Walt, 1819-1892. Printed version. Box 3, folder 173. n.d.. https://collections.library.yale.edu/catalog/2053805.

APA, 6th edition

Whitman, Walt, 1819-1892. (["Box 3, folder 173"])(n.d.)[Printed version]. https://collections.library.yale.edu/catalog/2053805.