MLA

Carson, Rachel, 1907-1964. Holograph and typescript, corrected. Box 101, folder 1892-93. n.d.. https://collections.library.yale.edu/catalog/17145202.

APA, 6th edition

Carson, Rachel, 1907-1964. (["Box 101, folder 1892-93"])(n.d.)[Holograph and typescript, corrected]. https://collections.library.yale.edu/catalog/17145202.