MLA

Longfellow, Henry Wadsworth, 1807-1882. Poems. September 11, 1886.. https://collections.library.yale.edu/catalog/32578434.

APA, 6th edition

Longfellow, Henry Wadsworth, 1807-1882. (September 11, 1886.)[Poems]. https://collections.library.yale.edu/catalog/32578434.