Cite

S[tephen] A[lonzo] Schoff engravings (2 copies)

MLA

Whitman, Walt, 1819-1892. S[tephen] A[lonzo] Schoff engravings (2 copies). Art, folder 237. n.d.. https://collections.library.yale.edu/catalog/2053860.

APA, 6th edition

Whitman, Walt, 1819-1892. (["Art, folder 237"])(n.d.)[S[tephen] A[lonzo] Schoff engravings (2 copies)]. https://collections.library.yale.edu/catalog/2053860.