MLA

Thoreau, Henry David, 1817-1862. "A House Which I Had Myself Built," essay, typescript, corrected. Box 1, folder 13. 1949. https://collections.library.yale.edu/catalog/2064510.

APA, 6th edition

Thoreau, Henry David, 1817-1862. (["Box 1, folder 13"])(1949)["A House Which I Had Myself Built," essay, typescript, corrected]. https://collections.library.yale.edu/catalog/2064510.