MLA

Carson, Rachel, 1907-1964. Typescript. Box 99, folder 1849. n.d.. https://collections.library.yale.edu/catalog/17410657.

APA, 6th edition

Carson, Rachel, 1907-1964. (["Box 99, folder 1849"])(n.d.)[Typescript]. https://collections.library.yale.edu/catalog/17410657.