MLA

Whitman, Walt, 1819-1892. W[illiam] J[ames] Linton engraving. Box 11, folder 236. 1878. https://collections.library.yale.edu/catalog/2054635.

APA, 6th edition

Whitman, Walt, 1819-1892. (["Box 11, folder 236"])(1878)[W[illiam] J[ames] Linton engraving]. https://collections.library.yale.edu/catalog/2054635.