Cite

Pencil sketch of Thoreau by D. Ricketson, photographic copy

MLA

Thoreau, Henry David, 1817-1862. Pencil sketch of Thoreau by D. Ricketson, photographic copy. Box 1, folder 10. n.d.. https://collections.library.yale.edu/catalog/2056833.

APA, 6th edition

Thoreau, Henry David, 1817-1862. (["Box 1, folder 10"])(n.d.)[Pencil sketch of Thoreau by D. Ricketson, photographic copy]. https://collections.library.yale.edu/catalog/2056833.