MLA

Whitman, Walt, 1819-1892. S.[amuel] Hollyer engravings. Box 4, folder 188. 1855. https://collections.library.yale.edu/catalog/2054479.

APA, 6th edition

Whitman, Walt, 1819-1892. (["Box 4, folder 188"])(1855)[S.[amuel] Hollyer engravings]. https://collections.library.yale.edu/catalog/2054479.